RuboCop: Fix warnings about wrong namespace

What does this MR do and why?

This MR fixes the following RuboCop warnings (introduced in !105772 (merged)):

ee/spec/lib/gitlab/geo/log_helpers_spec.rb: Rspec/DescribedClass has the wrong namespace - should be RSpec
ee/spec/controllers/concerns/routable_actions_spec.rb: Rspec/DescribedClass has the wrong namespace - should be RSpec
ee/spec/controllers/concerns/registrations/verification_spec.rb: Rspec/DescribedClass has the wrong namespace - should be RSpec
ee/spec/controllers/concerns/gitlab_subscriptions/seat_count_alert_spec.rb: Rspec/DescribedClass has the wrong namespace - should be RSpec

How to set up and validate locally

# On this MR

changed_files=$(git diff --name-only origin/master)

bundle exec rubocop -C false $changed_files

Inspecting 4 files
....

4 files inspected, no offenses detected


# On master

bundle exec rubocop -C false $changed_files

Inspecting 4 files
ee/spec/controllers/concerns/gitlab_subscriptions/seat_count_alert_spec.rb: Rspec/DescribedClass has the wrong namespace - should be RSpec
.ee/spec/controllers/concerns/registrations/verification_spec.rb: Rspec/DescribedClass has the wrong namespace - should be RSpec
.ee/spec/controllers/concerns/routable_actions_spec.rb: Rspec/DescribedClass has the wrong namespace - should be RSpec
.ee/spec/lib/gitlab/geo/log_helpers_spec.rb: Rspec/DescribedClass has the wrong namespace - should be RSpec
.

4 files inspected, no offenses detected

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.