[Feature flag] Delete flag 'Restrict access to jobs that use `CI_DEBUG_TRACE=True`'

What

Remove the :restrict_access_to_build_debug_mode feature flag. The flag is on by default.

Owners

• Team: verify:continuous integration
• Most appropriate slack channel to reach out to: #g_ci
• Best individual to reach out to: Allison Browne

Expectations

What are we expecting to happen?

What might happen if this goes wrong?

What can we monitor to detect problems with this?

Beta groups/projects

If applicable, any groups/projects that are happy to have this feature turned on early. Some organizations may wish to test big changes they are interested in with a small subset of users ahead of time for example.

• gitlab-org/gitlab project
• gitlab-org/gitlab-com groups
• ...

Roll Out Steps

• [-] Confirm that QA tests pass with the feature flag enabled (if you're unsure how, contact the relevant stable counterpart in the Quality department)
• [-] Enable on staging (/chatops run feature set feature_name true --staging)
• [-] Test on staging
• [-] Ensure that documentation has been updated
• [-] Enable on GitLab.com for individual groups/projects listed above and verify behaviour (/chatops run feature set --project=gitlab-org/gitlab feature_name true)
• [-] Coordinate a time to enable the flag with the SRE oncall and release managers
  • In #production mention @sre-oncall and @release-managers. Once an SRE on call and Release Manager on call confirm, you can proceed with the rollout
• [-] Announce on the issue an estimated time this will be enabled on GitLab.com
• [-] Enable on GitLab.com by running chatops command in #production (/chatops run feature set feature_name true)
• [-] Cross post chatops Slack command to #support_gitlab-com (more guidance when this is necessary in the dev docs) and in your team channel
• [-] Announce on the issue that the flag has been enabled
• Remove feature flag and add changelog entry
• After the flag removal is deployed, clean up the feature flag by running chatops command in #production channel

Note: Skipped many steps skipped due to the flag being enabled by default

Rollback Steps

• This feature can be disabled by running the following Chatops command:

/chatops run feature set --project=gitlab-org/gitlab feature_name false