Use Ruby methods, not Rails' String#first

See merge request gitlab-org/gitlab-ce!18669

[CE] Exclude LDAP from OmniauthCallbackController base methods

See merge request gitlab-org/gitlab-ce!18619

show only groups an admin is a member of in dashboards/grops

See merge request gitlab-org/gitlab-ce!17884

Gitaly-Ruby is not a Rails application, which made the method not exist
after the vendor. This patch uses direct indexing, which has the same
properties that `#first` has.

Found while working on: https://gitlab.com/gitlab-org/gitaly/merge_requests/699

Update timeline icon for description edit

Closes #39946

See merge request gitlab-org/gitlab-ce!18633

Fix spec/features/projects/issues/user_toggles_subscription_spec.rb

Closes #45918

See merge request gitlab-org/gitlab-ce!18666

Revert discussion counter height

Closes #45896

See merge request gitlab-org/gitlab-ce!18656

Fixed inconsistent protected branch pill baseline

Closes #41286 and #45354

See merge request gitlab-org/gitlab-ce!18409

Sanitize user name to avoid XSS attacks

See merge request gitlab/gitlabhq!2373

Serve archive requests with the correct file in all cases (10.7)

See merge request gitlab/gitlabhq!2376

Sanitize user name to avoid XSS attacks

See merge request gitlab/gitlabhq!2373

Serve archive requests with the correct file in all cases (10.7)

See merge request gitlab/gitlabhq!2376

Skip `authenticate_user!` for Doorkeeper controllers

Closes #44639

See merge request gitlab-org/gitlab-ce!18599

Use fast timeouts for Gitaly FooInProgress RPC's

See merge request gitlab-org/gitlab-ce!18655

Add developer documentation on diff handling and limits

Closes #43614

See merge request gitlab-org/gitlab-ce!18269

Use grpc 1.11.0

See merge request gitlab-org/gitlab-ce!18652

Backports EE changes from disabling branch unprotect UI

See merge request gitlab-org/gitlab-ce!18262

Don't automatically remove artifacts for pages jobs after pages:deploy has run

Closes #45481

See merge request gitlab-org/gitlab-ce!18628

Use GitLab Pages v0.9.1

Closes #45639

See merge request gitlab-org/gitlab-ce!18654

Makes namespaceless project destroy worker spec not depend on a specific migration version

See merge request gitlab-org/gitlab-ce!18650

Docs: review product categories in doc/README

Closes #45496

See merge request gitlab-org/gitlab-ce!18517

Remove legacy storage path call

See merge request gitlab-org/gitlab-ce!18598

Since we only need the `can?` view helpers there, it's better to
include those in a separate controller.

If we inherit from `ApplicationController` we also need to deal with
authentication, that needs to be done in some, but not all doorkeeper controllers.

Update index.md

See merge request gitlab-org/gitlab-ce!18450

Ports omniauth-jwt gem onto GitLab OmniAuth Strategies suite

See merge request gitlab-org/gitlab-ce!18580

Docs: update Pages for newbies

See merge request gitlab-org/gitlab-ce!18629