Port of 38869-issue to EE

See merge request gitlab-org/gitlab-ee!3232

CE Upstream - Monday

See merge request gitlab-org/gitlab-ee!3220

This reverts merge request !15009
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

This reverts commit 3c7eebdd.

This reverts commit 60f8ee06.

Geo: read-only safeguards was not working on Secondary node

Closes #3876

See merge request gitlab-org/gitlab-ee!3227

Fix LDAP group sync for nested groups

Closes #3854

See merge request gitlab-org/gitlab-ee!3217

Fix minor TYPOs in Geo docs

See merge request gitlab-org/gitlab-ee!3224

The member DNs are already normalized, so we only need to normalize the configured base string.

Merge branch 'pawel/bump_prometheus_gem_to_fix_read_all_values_returning_bad_data-39504' into 'master'

Update Prometheus Gem to fix problem caused by using wrong data offsets

See merge request gitlab-org/gitlab-ce!15081

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fix broken Members link when relative URL root paths are used

See merge request gitlab-org/gitlab-ee!3221

Navigating to the "Members" section of a project would omit the
relative URL root path. Fix the redirection and eliminate the
need for a redirection in the first place.

Related Rails issue discussing omitting the leading slash in the
redirect paths: https://github.com/rails/rails/issues/21193

Fix other redirections failing to work with relative roots.

Ee 38869 importer status - Remove code from global namespace

See merge request gitlab-org/gitlab-ee!3212

Geo: database-backed SSH key lookups are mandatory

See merge request gitlab-org/gitlab-ee!3209

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

[CE backport] Saved configuration for issue board

See merge request gitlab-org/gitlab-ce!15009

Use the correct project visibility in system hooks

Closes #39496

See merge request gitlab-org/gitlab-ce!15065

grab the correct username when confirming secondary email

Closes #39366

See merge request gitlab-org/gitlab-ce!15010

Remove Autosave class from global namespace

See merge request gitlab-org/gitlab-ce!14856

CE upstream: Friday

Closes gitlab-ce#39188, gitaly#683, #3664, and gitlab-ce#39351

See merge request gitlab-org/gitlab-ee!3214

Update docs on creating MRs

See merge request gitlab-org/gitlab-ce!14982

EE: Fetch the merged branches at once

See merge request gitlab-org/gitlab-ee!3204

Fetch the merged branches at once.

Checking it one by one in the view. We don't cache this yet
because this would already much improve the performance.

A naive test against a particularly large repository:

``` ruby
begin
  now = Time.now
  branches.map{ |b| r.merged_to_root_ref?(b.name) }
  Time.now - now
end # 8.265830782
```

Around 10 times faster:

``` ruby
begin
  now = Time.now
  r.merged_branches(branches.map(&:name))
  Time.now - now
end # 0.807405397
```

This should make the branches page usable.

See merge request gitlab-org/gitlab-ce!14729