[Feature flag] Roll-out custom emoji
## What https://gitlab.com/gitlab-org/gitlab/-/merge_requests/37911 introduces the `:custom_emoji` feature flag. This is part of the roadmap laid out in https://gitlab.com/groups/gitlab-org/-/epics/1820 This feature flag should be enabled when a viable minimal product has been reached according to the roadmap at https://gitlab.com/groups/gitlab-org/-/epics/1820 ## Owners - Team: ~"Community contribution" - Most appropriate slack channel to reach out to: `#mr-coaching` - Best individual to reach out to: `@toon` `@raju249` is doing most of the work to implement the feature. `@toon` is acting as the counterpart on the GitLab team to help out with this rollout. ## Expectations ### What are we expecting to happen? ### What might happen if this goes wrong? ### What can we monitor to detect problems with this? <!-- Which dashboards from https://dashboards.gitlab.net are most relevant? --> ## 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 - [x] Enable on staging - [x] Test on staging - [ ] Ensure that documentation has been updated - [x] Enable on GitLab.com for individual groups/projects listed above and verify behaviour - [ ] Coordinate a time to enable the flag with `#production` and `#g_delivery` on slack. - [ ] Announce on the issue an estimated time this will be enabled on GitLab.com - [x] Enable on GitLab.com by running chatops command in `#production` - [ ] Cross post chatops slack command to `#support_gitlab-com` ([more guidance when this is necessary in the dev docs](https://docs.gitlab.com/ee/development/feature_flags/controls.html#where-to-run-commands)) and in your team channel - [x] 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](https://docs.gitlab.com/ee/development/feature_flags/controls.html#cleaning-up) by running chatops command in `#production` channel
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