Fix avatar icon missing when Gravatar is disabled

Closes #34733 and #38715

See merge request gitlab-org/gitlab-ce!16681

Create merge request factory

See merge request gitlab-org/gitlab-ce!15964

[CE backport] Fix intermittent QA error -- Expand button not bound to JS

See merge request gitlab-org/gitlab-ce!16737

[CE backport] Fix QA new project creation click on incorrect namespace

See merge request gitlab-org/gitlab-ce!16736

Replace $.post in awards handler with axios

See merge request gitlab-org/gitlab-ce!16685

Resolve "MR "Check out branch" button should be disabled when the source branch is deleted"

Closes #42255

See merge request gitlab-org/gitlab-ce!16631

Improve Nginx configuration files

See merge request gitlab-org/gitlab-ce!16605

Mute notifications in the seeder to speed GDK development

See merge request gitlab-org/gitlab-ce!16747

Fix MR revert check when no merged_at is present

See merge request gitlab-org/gitlab-ce!16760

After source branch deletion the Merge request `Check out branch` button is disabled.

Fix JS equality rules in some specs

See merge request gitlab-org/gitlab-ce!16734

More conversions of $.ajax to axios

See merge request gitlab-org/gitlab-ce!16731

i18n flash message

Set alternate object directories in run_git

See merge request gitlab-org/gitlab-ce!16715

Resolve "Make tests running bundle install for gitaly more flexible"

Closes #42290

See merge request gitlab-org/gitlab-ce!16654

Digital Ocean Spaces now supports AWS v4 streaming API

See merge request gitlab-org/gitlab-ce!16745

See https://github.com/fog/fog-aws/issues/428#issuecomment-360869183

This fixes the avatar in issue assignments when the user hasn't got an
avatar and Gravatar is disabled.

Closes #34733

Callers expect a URL.

This fixes the avatars in commit lists when a user has no avatar and
Gravatar is disabled.

Closes #38715

Generalize toggle_buttons for JavaScript usage

See merge request gitlab-org/gitlab-ce!16689

Fix spec failures in issues_spec.rb

Closes #42488

See merge request gitlab-org/gitlab-ce!16744

Include the GitLab version info when commercial content on help page is disabled

Closes #42486

See merge request gitlab-org/gitlab-ce!16743

Part of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/4110

in certain conditions. And `first` was causing it to succeed even though the criteria were ambiguous.