Applying CE Patch for global deferred JS loading

See merge request !2569

Exclude sidekiq queues from execution in sidekiq-cluster

Closes #2893

See merge request !2571

Removed EE specific inline JS

See merge request !2592

EE: Don't include EmailHelpers manually, pick with rspec

See merge request !2591

Mention EES in protected branches feature

See merge request !2590

Port of fix-oauth-checkboxes to EE

See merge request !2588

Fix docs for using object storage for storing artifacts

See merge request !2580

`:mailer` is needed to pick it easily, while
`type: :mailer` is needed for picking it automatically for
tests located in spec/mailers/*_spec.rb

It's a bit complicated in spec/services/notification_service_spec.rb
but we'll leave it alone for now.

Make dropdown style on project page consistent

See merge request !2577

CE upstream - Friday

Closes gitaly#408, gitaly#411, and #1827

See merge request !2554

EE port of sidebar-fly-out-sub-nav

See merge request !2576

Add structured log messages to Geo LogCursor

See merge request !2574

[EE] Empty project factory by default

See merge request !2585

Add filtered search to group issue dashboard (EE)

See merge request !2581

Port of 34027-add-icons-to-sidebar to EE

See merge request !2568

Fix accessing individual files when artifacts are on object storage

See merge request !2564