CE Backport: Refactor Service Desk's bot user

See merge request gitlab-org/gitlab-ce!26671

It's not needed anymore as we've replaced boolean `support_bot` with
enum `bot_type`.

Enable RSpec/ExampleWording cop

See merge request gitlab-org/gitlab-ce!27187

Fixed fluid layout preference not being respected in diffs

Closes #52916

See merge request gitlab-org/gitlab-ce!27302

Fixes white background in the save button for environments

Closes #60261

See merge request gitlab-org/gitlab-ce!27161

Removes extra btn class from dropdown

Closes #60224

See merge request gitlab-org/gitlab-ce!27160

Allow unauthenticated downloads of Chrome

Closes #60441

See merge request gitlab-org/gitlab-ce!27297

Remove recommending moving the home dir to NFS

See merge request gitlab-org/gitlab-ce!27286

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/52916

Resolve CE/EE diff in text_utility_spec

See merge request gitlab-org/gitlab-ce!27291

Fixes stylelint issues for builds.scss

Closes #59896

See merge request gitlab-org/gitlab-ce!27279

Include fixed-width mixin instead of extending the class

See merge request gitlab-org/gitlab-ce!27277

The Google GPG key used to sign the apt repository expired today, so all
installs will fail unless `--allow-unauthenticated` is used. We should
revert this once the repository has been updated with the more recent
key.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/60441

Fix api group visibility

See merge request gitlab-org/gitlab-ce!26896

Added changelog and rebased

Merge branch '10015-move-ee-differences-for-app-assets-javascripts-boards-models-milestone-js' into 'master'

Backport of "Move EE differences for `app/assets/javascripts/boards/models/milestone.js`"

See merge request gitlab-org/gitlab-ce!27272

Increase timeout for notes_spec.js

See merge request gitlab-org/gitlab-ce!27270

CE Improve project settings page (leftovers)

See merge request gitlab-org/gitlab-ce!27078

Additionally fixes geo rename test.

Prioritize and simplify project settings content.

Replaces CSS with utility classes
Removes unused CSS

[ci skip]

Add missing provider_unauthorized method to import_github.rb

Closes #60347

See merge request gitlab-org/gitlab-ce!27218

Update GitLab Workhorse to v8.6.0

See merge request gitlab-org/gitlab-ce!27260

Increase clusters bundle specs timeout

Closes #60398

See merge request gitlab-org/gitlab-ce!27269

Resolve "Long file names in MR diffs cause horizontal scrolling"

Closes #60304

See merge request gitlab-org/gitlab-ce!27233

Revert "Remove HipChat integration from GitLab"

Closes #60042

See merge request gitlab-org/gitlab-ce!27172

Quarantine Issue suggestions spec

See merge request gitlab-org/gitlab-ce!27259

Better documentation on repo mirroring enqueuing

Closes gitlab-ee#10345

See merge request gitlab-org/gitlab-ce!27093

Docs: Refactor Pages' intro guide

See merge request gitlab-org/gitlab-ce!27136