CE upstream: Thursday

Closes gitaly#488 and gitlab-ce#36622

See merge request !2752

Reconfigure required for `db_key_base` update

See merge request !2754

Port of font-weight-adjusted to EE !12896

See merge request !2749

Support Elasticsearch v5.1 - v5.5

See merge request !2751

Display 'Check namespace plan' checkbox in admin area on GitLab.com, staging, or in development

See merge request !2750

Fix old MR diffs

Closes #36516

See merge request !13744

Add an option to list only archived projects

Closes #35994

See merge request !13492

For some old merge requests, we don't have enough information to figure out the
old blob and the new blob for the file. This means that we can't highlight the
diff correctly, but we can still display it without highlighting.

Search for issues with multiple assignees

See merge request !1889

Support simple string LDAP attribute specifications, and search for name rather…

See merge request !2746

Delegate Repository::branch_exists? and ref_exists? to Gitlab::Git

Closes gitaly#488

See merge request !13725

fix Merge request reference in merge commit is not global

Closes #36262

See merge request !13518

Resolve transient failures related to testing migrations

Closes #36745

See merge request !13761

Expose CI_PIPELINE_SOURCE on CI jobs

Closes #34165

See merge request !13759

Closes #35994

Fix inconsistent number of branches when remote branches are present

Closes #36934

See merge request !13784

Users of project mirrors would see that the number of branches did not
match the number in the branch dropdown because remote branches were
counted when Rugged was in use. With Gitaly, only local branches
are counted.

Closes #36934

Fix `Geo::ProjectRegistry.failed` scope to count projects where wiki sync failed.

See merge request !2747

Use full path of project's avatar in webhooks

Closes #36539

See merge request !13649

Support simple string LDAP attribute specifications, and search for name rather…

Closes #36841

See merge request !13776

Fix alignment of gpg status

Closes #36709

See merge request !13772

Support simple string LDAP attribute specifications, and search for name rather than username attributes

Support simple string LDAP attribute specifications, and search for name rather than username attributes

# Conflicts:
#	lib/gitlab/ldap/adapter.rb
#	spec/lib/gitlab/ldap/adapter_spec.rb

Add docs for multiple assignees AND filtering

See merge request !2745

Fix blank button not resetting project template value

Closes #36816

See merge request !13757

Update licensing query guidelines

Closes #36883

See merge request !13768

CE upstream: Wednesday

Closes gitaly#463, #3194, gitlab-ce#36810, gitlab-ce#36685, gitlab-ce#36722, gitlab-ce#36519, and gitlab-ce#36661

See merge request !2741