Add source and target branch filters to merge requests API

Closes #42492

See merge request gitlab-org/gitlab-ce!17355

Resolve "Externalization (i18n) documentation should say that whole shouldn't be split into several externalized words/group of words"

Closes #43294

See merge request gitlab-org/gitlab-ce!17151

Add ability to use external plugins as system hooks

See merge request gitlab-org/gitlab-ce!17003

CE Platform port for EE epics filtered search changes

See merge request gitlab-org/gitlab-ce!17445

init sidebar bundle separately to allow EE override

See merge request gitlab-org/gitlab-ce!17412

Use v-if in the expand button for performance

See merge request gitlab-org/gitlab-ce!17394

Forbid all inline script tags in Linter::InlineJavaScript

See merge request gitlab-org/gitlab-ce!17437

Tag migration specs with :sidekiq to clear queues between tests

See merge request gitlab-org/gitlab-ce!17442

Remove use of any_instance_of in runner spec

See merge request gitlab-org/gitlab-ce!17427

Bump GitLab CI image to use git 2.16

See merge request gitlab-org/gitlab-ce!17440

Removed protected_tags webpack bundle

See merge request gitlab-org/gitlab-ce!17334

This was failing in https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/55004375

git 2.15.0 has some significant performance improvements when running `git
fetch` on a repository that has lots of references. See
https://gitlab.com/gitlab-com/migration/issues/216#note_60672987 for more
details.

Refactor pipelines show for webpack bundle tag removal

See merge request gitlab-org/gitlab-ce!17127

Remove webpack bundle tag for enviroments

See merge request gitlab-org/gitlab-ce!17371

# Conflicts:
#   config/webpack.config.js

Cleanup webpack config

See merge request gitlab-org/gitlab-ce!17410

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

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

# Conflicts:
#   config/webpack.config.js

Add Assignees vue component missing data container

See merge request gitlab-org/gitlab-ce!17426

Make sure wiki exists when it's enabled

See merge request gitlab-org/gitlab-ce!17117

Remove pipelines mini graph spec that wasn't actually testing anything

Closes #43636

See merge request gitlab-org/gitlab-ce!17428

Remove cycle analytics bundle webpack entry point

See merge request gitlab-org/gitlab-ce!17407

Set security harness hook to executable after creation

Closes #43709

See merge request gitlab-org/gitlab-ce!17425

Document new job variables: CI_RUNNER_{REVISION,VERSION,EXECUTABLE_ARCH}

See merge request gitlab-org/gitlab-ce!16834

Replace whitespace demonstrating line-breaks in GFM docs

See merge request gitlab-org/gitlab-ce!16135