Tissue QA-Smoke job failure: `Invalid credentials for root`

Summary

It looks like we're not using the right credentials when calling the tests in this job on the pipeline. Re-runs of the job had different errors.

Failing job: https://ops.gitlab.net/gitlab-com/gl-infra/cells/tissue/-/jobs/16767041#L1258

Stack Trace

Failure/Error: raise Runtime::User::InvalidCredentialsError, "Invalid credentials for #{user.username}"
QA::Runtime::User::InvalidCredentialsError:
  Invalid credentials for root
# ./qa/page/main/login.rb:216:in `sign_in_using_gitlab_credentials'
# ./qa/page/main/login.rb:75:in `block in sign_in_using_credentials'
# ./qa/page/main/login.rb:67:in `sign_in_using_credentials'
# ./qa/flow/login.rb:28:in `block in sign_in'
# ./qa/scenario/actable.rb:16:in `perform'
# ./qa/flow/login.rb:22:in `sign_in'
# ./qa/resource/personal_access_token.rb:42:in `fabricate!'
# ./qa/resource/base.rb:60:in `block (2 levels) in fabricate_via_browser_ui!'
# ./qa/resource/base.rb:117:in `log_and_record_fabrication'
# ./qa/resource/base.rb:60:in `block in fabricate_via_browser_ui!'
# ./qa/resource/base.rb:107:in `do_fabricate!'
# ./qa/resource/base.rb:59:in `fabricate_via_browser_ui!'
# ./qa/runtime/user/store.rb:251:in `create_api_token_via_ui!'
# ./qa/runtime/user/store.rb:183:in `create_api_client'
# ./qa/runtime/user/store.rb:33:in `admin_api_client'
# ./qa/ce/strategy.rb:45:in `initialize_admin_api_client!'
# ./qa/ce/strategy.rb:17:in `perform_before_hooks'
# ./qa/ee/strategy.rb:11:in `perform_before_hooks'
# ./qa/runtime/release.rb:25:in `public_send'
# ./qa/runtime/release.rb:25:in `method_missing'
# ./qa/specs/spec_helper.rb:62:in `block (2 levels) in <top (required)>'
# ./qa/specs/runner.rb:95:in `run_rspec'
# ./qa/specs/runner.rb:30:in `perform'
# ./qa/scenario/template.rb:10:in `block in perform'
# ./qa/scenario/template.rb:8:in `perform'
# ./qa/scenario/template.rb:51:in `perform'
# ./qa/scenario/template.rb:10:in `block in perform'
# ./qa/scenario/template.rb:8:in `perform'
# ./qa/scenario/bootable.rb:52:in `launch!'