Allow users to preview features on GitLab.com deployments
We have been increasing the use of the canary infrastructure on GitLab.com, including an opt-out approach for some request paths. Most recently we have added https://next.gitlab.com which is a signal boost the community that they should try it out as well.
This issue to see if we can extend https://next.gitlab.com to apply to feature flags for the users to opt-in to features deployed to canary before they are available on GitLab.com. This would not work for all features on a deployment but could possibly be used for a subset and encourage us to start putting more features behind flags in the rails code, perhaps toggled with a cookie.
Specifically for next.gitlab.com, frontend features behind a feature flag would be the best candidate for adding to this page.
The delivery team did an investigation in using the feature flag feature https://gitlab.com/gitlab-org/release/framework/issues/32 but this unfortunately doesn't align well with this request because we use Flipper for GitLab feature flags.