Remove experimental GET /groups/:id/users
API endpoint and accompanying code
What does this MR do and why?
[!134570 (merged), !140241 (merged), !141040 (merged)] added experimental GET /groups/:id/users
endpoint. For this endpoint docs mention.
This endpoint is an experiment and might be changed or removed without notice.
We should be able to delete this endpoint despite it is being used by users, see https://log.gprd.gitlab.net/app/r/s/ZwMYZ
We started implementing this endpoint for Redesign the implementation of "Invite Members"... (#460261 - closed). As we need such endpoint for internal use, this endpoint is likely to be subject for change in the future, so we decided that will add internal endpoint instead of the API endpoint which we will be able to change at any time without notice. See #460261 (closed) description for more details.
This MR consists of commits that revert each of the mentioned MR separately. I decided to mention that as it may help with reviewing this MR.
Related to #550932 (closed)
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