Use configured values for Devise instead of hard-coded numbers

What does this MR do and why?

Fixes master:broken gitlab-org/quality/engineering-productivity/master-broken-incidents#8934.

      # spec/initializers/8_devise_spec.rb
      allow(Gitlab::CurrentSettings).to receive(:max_login_attempts).and_return(35)
      allow(Gitlab::CurrentSettings).to receive(:failed_login_attempts_unlock_period_in_minutes).and_return(15)

The state resulting to the above stubs are leaked causing specs in spec/models/concerns/require_email_verification_spec.rb to fail.

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Before

$ bin/rspec spec/initializers/8_devise_spec.rb spec/models/concerns/require_email_verification_spec.rb

......F.F....F.F....F.F....F.F....F.F....F.F....F.F...........F.F....F.F....F.F....F.F....F.F....F.F....F.F....F.F.

Finished in 24.78 seconds (files took 43.14 seconds to load)
115 examples, 30 failures

Failed examples:

rspec './spec/models/concerns/require_email_verification_spec.rb[1:2:2:3:1]' # RequireEmailVerification feature_flag_enabled: true, two_factor_enabled: true, oauth_user: true, skipped: true #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:2:3:2:1]' # RequireEmailVerification feature_flag_enabled: true, two_factor_enabled: true, oauth_user: true, skipped: true #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:3:2:3:1]' # RequireEmailVerification feature_flag_enabled: true, two_factor_enabled: true, oauth_user: true, skipped: false #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:3:3:2:1]' # RequireEmailVerification feature_flag_enabled: true, two_factor_enabled: true, oauth_user: true, skipped: false #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:4:2:3:1]' # RequireEmailVerification feature_flag_enabled: true, two_factor_enabled: true, oauth_user: false, skipped: true #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:4:3:2:1]' # RequireEmailVerification feature_flag_enabled: true, two_factor_enabled: true, oauth_user: false, skipped: true #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:5:2:3:1]' # RequireEmailVerification feature_flag_enabled: true, two_factor_enabled: true, oauth_user: false, skipped: false #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:5:3:2:1]' # RequireEmailVerification feature_flag_enabled: true, two_factor_enabled: true, oauth_user: false, skipped: false #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:6:2:3:1]' # RequireEmailVerification feature_flag_enabled: true, two_factor_enabled: false, oauth_user: true, skipped: true #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:6:3:2:1]' # RequireEmailVerification feature_flag_enabled: true, two_factor_enabled: false, oauth_user: true, skipped: true #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:7:2:3:1]' # RequireEmailVerification feature_flag_enabled: true, two_factor_enabled: false, oauth_user: true, skipped: false #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:7:3:2:1]' # RequireEmailVerification feature_flag_enabled: true, two_factor_enabled: false, oauth_user: true, skipped: false #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:8:2:3:1]' # RequireEmailVerification feature_flag_enabled: true, two_factor_enabled: false, oauth_user: false, skipped: true #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:8:3:2:1]' # RequireEmailVerification feature_flag_enabled: true, two_factor_enabled: false, oauth_user: false, skipped: true #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:10:2:3:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: true, oauth_user: true, skipped: true #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:10:3:2:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: true, oauth_user: true, skipped: true #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:11:2:3:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: true, oauth_user: true, skipped: false #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:11:3:2:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: true, oauth_user: true, skipped: false #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:12:2:3:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: true, oauth_user: false, skipped: true #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:12:3:2:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: true, oauth_user: false, skipped: true #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:13:2:3:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: true, oauth_user: false, skipped: false #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:13:3:2:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: true, oauth_user: false, skipped: false #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:14:2:3:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: false, oauth_user: true, skipped: true #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:14:3:2:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: false, oauth_user: true, skipped: true #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:15:2:3:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: false, oauth_user: true, skipped: false #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:15:3:2:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: false, oauth_user: true, skipped: false #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:16:2:3:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: false, oauth_user: false, skipped: true #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:16:3:2:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: false, oauth_user: false, skipped: true #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:17:2:3:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: false, oauth_user: false, skipped: false #attempts_exceeded? when failed_attempts is GTE Devise default amount is expected to eq true
rspec './spec/models/concerns/require_email_verification_spec.rb[1:17:3:2:1]' # RequireEmailVerification feature_flag_enabled: false, two_factor_enabled: false, oauth_user: false, skipped: false #lock_expired? when locked longer ago than Devise default time but shorter ago than overriden time is expected to eq true

After

$ bin/rspec spec/initializers/8_devise_spec.rb spec/models/concerns/require_email_verification_spec.rb
...................................................................................................................

Finished in 1 minute 0.38 seconds (files took 48.46 seconds to load)
115 examples, 0 failures

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