Migrate Gitlab::Git::Repository#merge_base_commit to Gitaly

Closes gitaly#808

See merge request gitlab-org/gitlab-ce!15770

Docs: add indexes for monitoring and performance monitoring

See merge request gitlab-org/gitlab-ce!15942

clearer-documentation-on-inline-diffs

See merge request gitlab-org/gitlab-ce!15938

Add commit diff discussion in merge request context documentation

See merge request gitlab-org/gitlab-ce!15885

Update flipper to 0.11.0 and take advantage of the new features

See merge request gitlab-org/gitlab-ce!15920

Converted JS files into exported modules

See merge request gitlab-org/gitlab-ce!15933

Fixed doc for create MR from email

See merge request gitlab-org/gitlab-ce!15849

Include project in BatchLoader key to prevent returning blobs for the wrong project

Closes gitlab-ee#4325

See merge request gitlab-org/gitlab-ce!15936

sorting for tags api

See merge request gitlab-org/gitlab-ce!15772

Clear caches before updating MR diffs

See merge request gitlab-org/gitlab-ce!15916

Dependencies Validator fails when depended job is `manual`

Closes #41110

See merge request gitlab-org/gitlab-ce!15924

Update GitLab QA dependencies

See merge request gitlab-org/gitlab-ce!15929

Bump gitlab-shell version to 5.10.3

See merge request gitlab-org/gitlab-ce!15932

gitlab-shell 5.10.3 does not introduce any new features; it just removes an
unused config option.

Make mail notifications of discussion notes In-Reply-To of each other

Closes #36054

See merge request gitlab-org/gitlab-ce!14289

Use author info on commits list page rather than most recent commit date

Closes #25317

See merge request gitlab-org/gitlab-ce!15868

The hook ordering influenced the diffs being generated as these used
values from before the update due to the memoization still being in
place. This commit reorders them and tests against this behaviour.

Use a dedicated queue for each Sidekiq worker

See merge request gitlab-org/gitlab-ce!15882

Clarifies documentation for user, group & project transfers

See merge request gitlab-org/gitlab-ce!15896

Export date utility functions as ES6 modules

See merge request gitlab-org/gitlab-ce!15782

- Added an ActiveSupport (using Rails.cache) caching adapter
- Overview of the new features can be found at https://johnnunemaker.com/flippin-features-at-runtime/
- Full Changelog can be found at https://github.com/jnunemaker/flipper/blob/v0.11.0/Changelog.mdSigned-off-by: Rémy Coutable <remy@rymai.me>

Corrected typo in quick action data attribute

Closes #41035

See merge request gitlab-org/gitlab-ce!15872

When a note is part of a discussion, the email sent out will be
`In-Reply-To` the previous note in that discussion. It also
`References` all the previous notes in that discussion, and the
original issue.

Closes gitlab-org/gitlab-ce#36054.

When a note is part of a discussion, the email sent out should be
`In-Reply-To` the previous note in that discussion.

Closes gitlab-org/gitlab-ce#36054

Adds ordering to projects contributors in API

Closes #13695

See merge request gitlab-org/gitlab-ce!15469

Unify dialog modal/popup dialog/confirmation dialog/modal to modal

See merge request gitlab-org/gitlab-ce!15865

Update issuable status icons

Closes #33926

See merge request gitlab-org/gitlab-ce!15898

Cache feature check for 1 minute for MethodCall instrumentation toggle

See merge request gitlab-org/gitlab-ce!15800