Only shows loading for the first request

Closes #2117

See merge request !1620

Make webpack-dev-server process more resilient when switching branches.

Closes #30678

See merge request !10581

Fix redundant cache expiration in Repository

Closes #30146

See merge request !10575

Don't show 'Copy content' button on text files that are not rendered as text

See merge request !10563

* '9-1-ce-upstream' of https://gitlab.com/gitlab-org/gitlab-ee:
  Fix spinach specs
  Fix spec/features/merge_requests/only_allow_merge_if_build_succeeds_spec.rb

Add docs for Service Desk

Closes #2094

See merge request !1586

Fix "Generate new recovery codes using SSH" documentation link

See merge request !10512

Disclaimer for testing guide not be be used in prod

See merge request !10468

Fix bad resolved conflict for app/assets/javascripts/environments/folder/environments_folder_view.js

Backport of EE changes in environments tests

See merge request !10528

Backport Git-env code from EE "Fix push rules on Git 2.11" (gitlab-org/gitlab-ee!1525)

See merge request !10547

Document how polling interval multiplier is used

Closes #30686

See merge request !10592

Add vue loader

Closes #29519

See merge request !10517

[ci skip]

[ci skip]

[ci skip]

Reuse "merge_requests_for_nodes" in "MergeRequestParser"

See merge request !10585

Remove broken link on gitlab_flow.md

Closes #25274

See merge request !10590