So they are reusable for EE later

When there were `AccessLevels` for users/groups in the protected
branch. The CE view doesn't handle those correctly.

So a specific view for EE has been added to deal with the case.

It also shows the users/groups that still have access.

In this case `app/models/concerns/protected_ref_access` had EE
specific code in `app/models/ee/protected_ref_access`. It should have
been `app/models/concerns/ee/protected_ref_access`.

That way they are available to the dispatcher and don't need to be
imported there.

And bring the views from CE into EE as a fallback when the feature
isn't available

And move the EE files into `EE` folder.

When the feature isn't available

And move the EE-specifics into a separate bundle

And restore the CE views to be able to fall back to them when the
feature is not available

Don't allow removing MR approvers when project setting is set

Closes #2807

See merge request !2395

When the `disable_overriding_approvers_per_merge_request` setting is set, we
shouldn't let people remove approvers or groups from merge requests, but should
let them do so from the project.

Added audit logs to new admin sidebar

Closes #2920

See merge request !2421

Fix duplicate related issue reference inserted when using autocomplete

Closes #2914

See merge request !2420

Closes #2920

MR branch link now links to tree instead of commits (EE)

Closes #2890

See merge request !2416

Fix https://gitlab.com/gitlab-org/gitlab-ee/issues/2914

Fix spec/helpers/award_emoji_helper_spec.rb by using `iid` instead of `id`

Closes gitlab-ee#2890

See merge request !12770

MR branch link now links to tree instead of commits

Closes #34243

See merge request !12763

Automatically link Kerberos users and LDAP people

Closes #1552

See merge request !2405

Reset available mirror capacity to 0 when it falls below 0

See merge request !2409

Artifacts store does not use default value

See merge request !2411

Fix access checks for rebasing an MR

Closes #2891

See merge request !2414

Split Elasticsearch docs to admin and user

Closes #2056

See merge request !2375

Port of CE Update vue-resource

See merge request !2378