Bump google-protobuf to 3.6.1

See merge request gitlab-org/gitlab-ce!22559

It looks like gRPC may have worked around
https://github.com/google/protobuf/issues/4210 via
https://github.com/grpc/grpc/pull/14634.

This is needed to support Ruby 2.5
(https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22555).

Sync group sidebar template with EE

See merge request gitlab-org/gitlab-ce!22549

Resolve "Endless scroll loader is visible on user profile overview page"

Closes #53023

See merge request gitlab-org/gitlab-ce!22529

Fix link in doc/user/project/repository/branches/index.md

See merge request gitlab-org/gitlab-ce!22554

doc: Fix broken link hrefs for ee and gitlab-versions

See merge request gitlab-org/gitlab-ce!22540

Add instructions on how to enable a feature flag

Closes gitlab-org/release/framework#23

See merge request gitlab-org/gitlab-ce!22518

Correcting a typo

See merge request gitlab-org/gitlab-ce!22511

Administrator documentation for Pages access control

See merge request gitlab-org/gitlab-ce!22146

- Allow to extend nav links for the Group sidebar

Removes duplicate escape from job item

Closes #53013

See merge request gitlab-org/gitlab-ce!22536

Fix ee-compat-check by not modifying frozen strings

Closes #53030

See merge request gitlab-org/gitlab-ce!22527

Add review app

Closes #52188 and #49569

See merge request gitlab-org/gitlab-ce!22010

Update dev security workflow template

See merge request gitlab-org/gitlab-ce!22532

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

* Use 2 space indentation in review-apps.sh script
* Move automated_review_cleanup back to build stage

* Uses the same supporting code as used in EE
* Includes automated cleanup
* Install external-dns helm chart to review apps cluster if it isn't
already
* Adds variables REVIEW_APPS_AWS_SECRET_KEY and
REVIEW_APPS_AWS_ACCESS_key
* review-apps-ce uses a different cipher

Improve review apps

Closes #6875

See merge request gitlab-org/gitlab-ee!6665

[ci skip]

Tooltips aren't using v-html anymore thus causing
escape not to be needed

Update Runner Chart to 0.1.35

See merge request gitlab-org/gitlab-ce!22541

Add dbname to MySQL migration GRANT command

See merge request gitlab-org/gitlab-ce!21719

Support licenses and performance

See merge request gitlab-org/gitlab-ce!22175

Update Todo icons in collapsed sidebar for Issues and MRs

See merge request gitlab-org/gitlab-ce!22534

Alias the lfs_enabled method

Closes #49348

See merge request gitlab-org/gitlab-ce!22501

Add RoleBinding method and class

See merge request gitlab-org/gitlab-ce!22524

Remove broken git storage for testing

See merge request gitlab-org/gitlab-ce!22530

Add `Any` option to milestone filter

See merge request gitlab-org/gitlab-ce!22351

Resolve "Filter discussion (tab) by comments or activity in issues and merge requests"

Closes #26723

See merge request gitlab-org/gitlab-ce!19193