Fixed performance of projects dropdown

Closes #41939

See merge request gitlab-org/gitlab-ce!16425

Use simple Next/Prev paging for CI Jobs page

Closes #41058

See merge request gitlab-org/gitlab-ce!16392

Update missing API documentation on `GET /users/:id/projects`

Closes #41478

See merge request gitlab-org/gitlab-ce!16363

Docs: remove duplicate CI examples

Closes #41872

See merge request gitlab-org/gitlab-ce!16372

Added .rej files to gitignore

See merge request gitlab-org/gitlab-ce!16429

Resolve "Fix type is started key"

Closes #41937

See merge request gitlab-org/gitlab-ce!16407

[ci skip]

Resolve "Wording fixes on cluster page"

Closes #41797

See merge request gitlab-org/gitlab-ce!16324

Closes #41939

Update the grpc gem to 1.8.3

See merge request gitlab-org/gitlab-ce!16354

Add a note about GitLab QA page objects validator to docs

See merge request gitlab-org/gitlab-ce!16424

Fix Ctrl+Enter keyboard shortcut saving comment/note edit

Closes #41956

See merge request gitlab-org/gitlab-ce!16415

Refactor dispatcher project branches path

See merge request gitlab-org/gitlab-ce!16398

Refactor dispatcher projects blame and blob path

See merge request gitlab-org/gitlab-ce!16369

Update export message to mention we can download the file from the UI

See merge request gitlab-org/gitlab-ce!16419

Resolve "Attachments in e-mail notifications are using the wrong URL"

Closes #41882

See merge request gitlab-org/gitlab-ce!16364

Fix Route validation when conflicting permanent redirects exist

Closes gitlab-com/support-forum#2883 and #41786

See merge request gitlab-org/gitlab-ce!16397

Resolve "Subscribe button tooltip on issues page causes visual stuttering"

Closes #37077

See merge request gitlab-org/gitlab-ce!16411

Add reason to keep postgresql 9.2 for CI

See merge request gitlab-org/gitlab-ce!16277

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/41956

Migrate rebase_in_progress? to Gitaly

Closes gitaly#866

See merge request gitlab-org/gitlab-ce!16286

Migrate Gitlab::Git::Repository#rebase to Gitaly

Closes gitaly#863

See merge request gitlab-org/gitlab-ce!16259

Remove warning noise in ProjectImportOptions

See merge request gitlab-org/gitlab-ce!16410

Refactor dispatcher dashboard mr path

See merge request gitlab-org/gitlab-ce!16360

Squlches these warnings:

```
/opt/gitlab/embedded/service/gitlab-rails/app/workers/concerns/project_import_options.rb:5: warning: already initialized constant ProjectImportOptions::IMPORT_RETRY_COUNT
/opt/gitlab/embedded/service/gitlab-rails/app/workers/concerns/project_import_options.rb:5: warning: previous definition of IMPORT_RETRY_COUNT was here
```

Refactor dispatcher project boards path

See merge request gitlab-org/gitlab-ce!16374

Improve wording about additional costs with Ingress on GKE or custom clusters

Closes #41163

See merge request gitlab-org/gitlab-ce!16370

- Change Gitlab to GitLab
- Remove trailing space on GitLab Integration link

Fix padding for pipeline dropdowns after bad merge

Closes #41221

See merge request gitlab-org/gitlab-ce!15982