Merge branch 'approvals-spec-fix-for-816' into '8-16-stable-ee'

See merge request !1238

Fix approvals spec for 8-16-stable

See merge request !1231

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Move RepositoryUpdateRemoteMirrorWorker jobs to project_mirror Sidekiq queue

See merge request !1234

We moved RepositoryUpdateMirrorWorker to the project_mirror queue in
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/900

RepositoryUpdateMirrorWorker should also exist in the project_mirror
queue and retry should be false.

Port of "API: Consolidate /projects endpoint" to EE

See merge request !1232

It consolidates these endpoints:
 - /projects
 - /projects/owned
 - /projects/visible
 - /projects/starred
 - /projects/all

Into the /projects endpoint using query parameters.

Backport "Move /projects/fork/:id to /projects/:id/fork"

See merge request !1228

Fix missing file extension for CHANGELOG entry

See merge request !1229

EE: Enable Style/RedundantException, Lint/EmptyWhen, and RSpec/ExpectActual cops

See merge request !1227

Backport "Remove deprecated templates endpoints in V4"

See merge request !1214

[EE] Resolve "GroupsController#activity.json is REALLY slow due to SQL"

See merge request !1226

CE upstream

Closes gitlab-com/gitlab-docs#68 and #1051

See merge request !1225

This is a little too picky, even for us.

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

Also, don't use limit in subquery, MySQL don't like that.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

# Conflicts:
#   app/models/repository.rb

[EE] Update Rubocop to Ruby 2.3

See merge request !1195

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

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

CE Upstream - Friday

Closes gitlab-ce#27955

See merge request !1218

Add member: Always return 409 when a member exists

See merge request !1215

Updated issue boards docs

Closes #27872

See merge request !9097

Add member: Always return 409 when a member exists

Closes #20732

See merge request !9093

removes grayish blue color for events activity

Closes #27608

See merge request !9179

Gather issuable  metadata to avoid n+ queries on index view

Closes #25900

See merge request !9006