Move forking to Gitaly

Closes gitaly#817 and gitaly#1236

See merge request gitlab-org/gitlab-ce!19990

Counting commits is done by Gitaly

Closes gitaly#382

See merge request gitlab-org/gitlab-ce!19983

Resolve "Slack Tag push notifications are not send (only default branch option)"

Closes #45487

See merge request gitlab-org/gitlab-ce!19864

Eliminate N+1 queries in LFS file lock checks during a push

See merge request gitlab-org/gitlab-ce!19978

Closes https://gitlab.com/gitlab-org/gitaly/issues/817

Closes https://gitlab.com/gitlab-org/gitaly/issues/1236

Fix group pagination and add sort by id to groups and subgroups

Closes #47409

See merge request gitlab-org/gitlab-ce!19665

Extract EE-specific lines from discussion views

See merge request gitlab-org/gitlab-ce!19831

Remove label examples from headings

See merge request gitlab-org/gitlab-ce!19982

Move language detection to mandatory

Closes gitaly#732 and gitaly#360

See merge request gitlab-org/gitlab-ce!19985

Rebase and Squash in progress are Gitaly only

Closes gitaly#865 and gitaly#1018

See merge request gitlab-org/gitlab-ce!19987

Move info attributes to mandatory

Closes gitaly#1082

See merge request gitlab-org/gitlab-ce!19988

Move count commit to mandatory

Closes gitaly#330

See merge request gitlab-org/gitlab-ce!19984

License detection happens solely through Gitaly now

Closes gitaly#1026

See merge request gitlab-org/gitlab-ce!19986

Fix omniauth link, site has moved.

See merge request gitlab-org/gitlab-ce!19957

Make it explicit where is the gitlab.rb file

See merge request gitlab-org/gitlab-ce!19963

Add Open in Xcode docs

See merge request gitlab-org/gitlab-ce!19872

Fix flakey time-sensitive notes creation specs that rely on background Sidekiq jobs

Closes #48093

See merge request gitlab-org/gitlab-ce!19979

Closes https://gitlab.com/gitlab-org/gitaly/issues/382

Rails5 fix format in uploads actions

Closes #46276

See merge request gitlab-org/gitlab-ce!19907

Closes https://gitlab.com/gitlab-org/gitaly/issues/1082

Bring CE-EE parity to migrations/remove_soft_removed_objects_spec.rb

See merge request gitlab-org/gitlab-ce!19966

Closes https://gitlab.com/gitlab-org/gitaly/issues/865
Closes https://gitlab.com/gitlab-org/gitaly/issues/1018

Extract EE specific files/lines for spec/lib/gitlab/ci

See merge request gitlab-org/gitlab-ce!19971

Migration: https://gitlab.com/gitlab-org/gitaly/issues/1026

Conflicts:
	lib/gitlab/git/repository.rb

Closes https://gitlab.com/gitlab-org/gitaly/issues/732
Closes https://gitlab.com/gitlab-org/gitaly/issues/360

Fix nil formats test

Closes #47833

See merge request gitlab-org/gitlab-ce!19941

Closes https://gitlab.com/gitlab-org/gitaly/issues/330

Fix indentation in CI yaml

See merge request gitlab-org/gitlab-ce!19737

Better make it clearer under each section what the labels are
rather than listing a subset of them in the section title

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/48093

We use `perform_enqueued_jobs` because it is "adapter-agnostic so it's better to use it over Sidekiq::Testing.inline!." -- https://gitlab.com/gitlab-org/gitlab-ce/issues/22991

This significantly improves performance when a user pushes many references.

project.path_locks.any? doesn't cache the output and runs `SELECT 1 AS one
FROM "path_locks" WHERE project_id = N` each time. When there are thousands
of refs being pushed, this can time out the unicorn worker.

CE port for https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/6159.

Remove top margin from checkboxes in integrations page

See merge request gitlab-org/gitlab-ce!19976

Resolve "BS4: Labels in issues system notes are misaligned again"

Closes #48072

See merge request gitlab-org/gitlab-ce!19972

Resolve "Use long sha version in MR widget copy to clipboard button"

Closes #48050

See merge request gitlab-org/gitlab-ce!19955

Buttons disappear on merge request page in some case

Closes #46861 and #14348

See merge request gitlab-org/gitlab-ce!19176