Re-implemented image commenting on diffs

Closes #48956

See merge request gitlab-org/gitlab-ce!22443

Merge branch '52771-ldap-users-can-t-choose-private-or-internal-when-creating-a-new-group' into 'master'

Fix new group visibility form for non-admins

Closes #52771

See merge request gitlab-org/gitlab-ce!22468

CE port: Remove instance autocomplete_service variable

See merge request gitlab-org/gitlab-ce!22847

Update issue_workflow.md: team labels

See merge request gitlab-org/gitlab-ce!22800

CI/CD coverage docs: fix pytest-cov regex

Closes #48613

See merge request gitlab-org/gitlab-ce!22842

Fix bug with wiki page create message

Closes #50890

See merge request gitlab-org/gitlab-ce!22849

Fix statement timeouts in RemoveRestrictedTodos migration

Closes #52649

See merge request gitlab-org/gitlab-ce!22795

Use merge request prefix symbol in event feed title

Closes #36267

See merge request gitlab-org/gitlab-ce!22449

Add a helper method to append path to a base URL

See merge request gitlab-org/gitlab-ce!22854

Little typo in markdown.md

See merge request gitlab-org/gitlab-ce!22851

In Ruby 2.4, `URI.join("http://test//", "a").to_s` will
remove the double slash, however it's not the case in
Ruby 2.5. Using chomp should work better for the intention,
as we're not trying to allow things like ../ or / paths
resolution.

This helper method append path to host, making sure
there's one single slash as path separator.

Removes an owner permission check before rendering the visibility
select radio inputs as non-admins will not have permission.

Ensures all users creating a group can select its visibility.

Rails5: fix mysql milliseconds issue in deployment model specs

See merge request gitlab-org/gitlab-ce!22850

Add AWS installation docs

Closes #49501

See merge request gitlab-org/gitlab-ce!20778

Extract code into IssueBoardEntity / serializer

See merge request gitlab-org/gitlab-ce!22760

Renders a warning block for archived job

Closes #53535

See merge request gitlab-org/gitlab-ce!22811

Allow single letter external issue IDs

Closes #52803

See merge request gitlab-org/gitlab-ce!22717

Stop Repository#fetch_remote from using Gitlab::Shell

See merge request gitlab-org/gitlab-ce!22635

CE MR for Group SAML SSO badges

See merge request gitlab-org/gitlab-ce!22587

Fixed label removal from issue

Closes #51052

See merge request gitlab-org/gitlab-ce!22762

Disable stop environment button while deployment is running

See merge request gitlab-org/gitlab-ce!22805

Delegate storage health check to Gitaly's health check

Closes gitaly#1336

See merge request gitlab-org/gitlab-ce!22063

Add packages section to CE config file

See merge request gitlab-org/gitlab-ce!22151

Resolve "Redesign activity feed"

Closes #49403

See merge request gitlab-org/gitlab-ce!22217

Restore changes from:

See merge request gitlab-org/gitlab-ce!22838

Backport support project security dashboard changes

See merge request gitlab-org/gitlab-ce!22824

adapted regular expression to correctly parse total coverage when using pytest-cov

> ----------- coverage: platform linux, python 3.6.6-final-0 -----------
> Name                      Stmts   Miss  Cover
> ---------------------------------------------
> integrade/__init__.py         0      0   100%
> integrade/api.py             86      0   100%
> integrade/config.py          36      1    97%
> integrade/exceptions.py       3      0   100%
> integrade/utils.py           11      0   100%
> tests/test_api.py           153      0   100%
> tests/test_config.py         46      0   100%
> tests/test_integrade.py       6      0   100%
> tests/test_utils.py          12      0   100%
> ---------------------------------------------
> TOTAL                       353      1    99%

issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/48613