Generalize protected branch/tag dropdowns -- CE backport

See merge request gitlab-org/gitlab-ce!16420

Introduce PredicateMemoization cop

Closes #41731

See merge request gitlab-org/gitlab-ce!16329

* upstream/master:
  Docs: move article "Autoscaling Runners on AWS" to its topic-related dir
  Update missing API documentation on `GET /users/:id/projects`
  Docs: remove duplicate CI examples
  Only search for MR revert commits on notes after MR was merged
  Added .rej files to gitignore
  Fixed performance of projects dropdown
  Add a note about GitLab QA page objects validator to docs
  Refactor dispatcher projects blame and blob path
  Fix Ctrl+Enter keyboard shortcut saving comment/note edit
  Fix boolean prop being provided as string
  Fixes minor aspects on Prometheus description
  Refactor dispatcher project branches path
  Use simple Next/Prev paging for jobs to avoid large count queries on arbitrarily large sets of historical jobs
  Update the grpc gem to 1.8.3

Resolve "!15665 consistently 502s because it fetches every commit"

Closes #41807

See merge request gitlab-org/gitlab-ce!16320

Docs: move article "Autoscaling Runners on AWS" to its topic-related dir

See merge request gitlab-org/gitlab-ce!16368

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

If we search for notes before the MR was merged, we have to load every commit
that was ever part of the MR, or mentioned in a push. In extreme cases, this can
be tens of thousands of commits to load, but we know they can't revert the merge
commit, because they are from before the MR was merged.

In the (rare) case that we don't have a `merged_at` value for the MR, we can
still search all notes.

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

with StrongMemoize

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

Remove duplicate ee code

This was generalized for usage in the new variable table design, see
https://gitlab.com/gitlab-org/gitlab-ce/issues/39118#note_53615249

Conflicts:
	app/assets/stylesheets/pages/projects.scss
	ee/app/assets/javascripts/protected_branches/protected_branch_create.js
	ee/app/assets/javascripts/protected_tags/protected_tag_create.js
	ee/app/views/projects/protected_branches/ee/_dropdown.html.haml

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