Merge branch 'rc-new-members-approve-request-access-service' into 'master'
New `Members::ApproveAccessRequestService` Part of #21979. ## Does this MR meet the acceptance criteria? - [x] API support added - Tests - [x] Added for this feature/bug - [x] All builds are passing - [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html) - [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides) - [x] Branch has no merge conflicts with `master` (if you do - rebase it please) - [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits) See merge request !6266
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