And several other failures

Fix unable to expand text diff discussion comments

Closes #38940

See merge request gitlab-org/gitlab-ce!14792

Use Gitaly 0.45.1 and gitaly-proto 0.41.0

See merge request gitlab-org/gitlab-ce!14787

Stop using `branch_names.include?` and use `branch_exists?`

See merge request gitlab-org/gitlab-ce!14778

Remove u2f from global namespace

See merge request gitlab-org/gitlab-ce!14776

Flash is now a ES6 module

See merge request gitlab-org/gitlab-ce!14626

Fix a liniting error introduced by !14652

See merge request gitlab-org/gitlab-ce!14790

Resolve "Private Avatars are not CDN compatible"

Closes #38245 and gitlab-com/support-forum#2476

See merge request gitlab-org/gitlab-ce!14443

Fix text for the merge request lock system note

Closes #38941

See merge request gitlab-org/gitlab-ce!14779

Trigger change event of the markdown textarea to allow Vue catch the programmatic changes.

Closes #38441

See merge request gitlab-org/gitlab-ce!14539

Also warn on timestamp in datetime migration cop

See merge request gitlab-org/gitlab-ce!14784

Remove Build code from global namespace

See merge request gitlab-org/gitlab-ce!14744

Migrate Workhorse Send{Diff,Patch} to Gitaly

See merge request gitlab-org/gitlab-ce!14652

Backports EE 38771 changes to CE.

See merge request gitlab-org/gitlab-ce!14782

The types `timestamp` and `datetime` are aliases:
https://github.com/rails/rails/blob/v4.2.10/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb#L362-L364