[Feature flag] Rollout of `ci_mini_pipeline_gl_dropdown`

What

Remove the :ci_mini_pipeline_gl_dropdown feature flag which removes jQuery from the mini pipeline graph. Introduced in !52821 (merged)

This change is visible in:

• Pipelines list (e.g. http://gdk.test:3000/root/my-project/-/pipelines)
• MR widget (e.g. http://gdk.test:3000/root/my-project/-/merge_requests/3)
• Commit -> Pipelines list (e.g. http://gdk.test:3000/root/my-project/-/commit/90899dd422cfa8608ee206e028128cdabe58d596/pipelines)

Owners

• Team: ~"group::continuous integration"
• Most appropriate slack channel to reach out to: #g_ci
• Best individual to reach out to: @mrincon

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

• Enable on staging (/chatops run feature set ci_mini_pipeline_gl_dropdown 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 ci_mini_pipeline_gl_dropdown true
  • /chatops run feature set --project=gitlab-org/gitlab-ui ci_mini_pipeline_gl_dropdown true
  • /chatops run feature set --project=gitlab-com/www-gitlab-com ci_mini_pipeline_gl_dropdown 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 ci_mini_pipeline_gl_dropdown 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
  • Remove duplication in spec/frontend/pipelines/stage_spec.js
  • Rename ref="stageGlDropdown" to simply ref="dropdown" !55852 (merged)
  • #299899 (closed) should be closed along with the removal.
• After the flag removal is deployed, clean up the feature flag by running chatops command in #production channel

Rollback Steps

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

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