Default enabled group_level_integrations feature flag
What does this MR do?
Default enabled group_level_integrations
feature flag. Actually, this enables group-level integrations.
By enabling by default, we are able to deliver this to both GitLab.com and self-hosted users while maintaining control on GitLab.com to disable if needed.
There is another merge request to remove the feature flag in a future milestone !44909 (merged).
Related to #238575 (closed)