Fix remote mirrors not updating after tag push

Closes #51240

See merge request gitlab-org/gitlab-ce!28430

Remote mirrors were only being updated after pushes to branches, not
tags. This change consolidates the functionality into
Git::BaseHooksService so that both tags and branches will now update
remote mirrors.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/51240

Immediate configuration is not ideal for group and instance
level clusters as projects that may never be deployed would
still have Kubernetes namespaces and service accounts created
for them.

As of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/25586
we now create only the resources that are required for the
project being deployed, at the time of deployment.

Adds suffix to enum methods and changes `in_groups` to
`of_groups`

Properly handle LFS Batch API response in project import

Closes #61624

See merge request gitlab-org/gitlab-ce!28223

Pull mirrors would run the `Projects::AfterImportService`, which would
force a `git gc` each time it finished. This is overkill and not
necessary now that we have refs packed more frequently
(https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/27826).

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/11556

A project admin attempting to invite an already-invited user
will see a confusing Error 500 message.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/61574

Project imports were failing with `undefined method each_with_object for
String` because the import was attempting to parse the LFS Batch API and
failing due to the fact that the Content-Type wasn't a supported format
(e.g. application/vnd.git-lfs+json instead of application/json). We now
parse the body as JSON.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/61624