Add foreign keys to various tables that point to the "projects" table

See merge request !9388

Update Prometheus Metrics Library

See merge request !12621

Fix stubbing attributes alongside cache_markdown_field

Closes #34698

See merge request !12661

This cop has been renamed to ActiveRecordSerialize to match the way
"ActiveRecord" is usually written.

These IDs point to non-existing rows, causing the foreign key
constraints to fail.

This is allowed for existing instances so we don't end up 76 offenses
right away, but for new code one should _only_ use this if they _have_
to remove non database data. Even then it's usually better to do this in
a service class as this gives you more control over how to remove the
data (e.g. in bulk).

This removes the need for relying on Rails' "dependent" option for data
removal, which is _incredibly_ slow (even when using :delete_all) when
deleting large amounts of data. This also ensures data consistency is
enforced on DB level and not on application level (something Rails is
really bad at).

This commit also includes various migrations to add foreign keys to
tables that eventually point to "projects" to ensure no rows get
orphaned upon removing a project.

Add user projects API

Closes #33657

See merge request !12596

Fix a nasty transient failure happening is a subsequent spec

Closes #34698

See merge request !12664

Fix invalid integer value when more than 1000 commits

Closes #34711

See merge request !12659

Introduce cache policies for CI jobs

Closes #33772

See merge request !12483

Resolve "Project option to allow customizing CI/CD config path"

Closes #32815 and #33130

See merge request !12509

Fix Rubocop offense

See merge request !12665

Synchronize changes in community translation of msgid

See merge request !12646

Add Italian translations of Commits Page

See merge request !12645

Add Bulgarian translations of Commits Page

See merge request !12411

Add Esperanto translations of Commits Page

See merge request !12410

Add Traditional Chinese in HongKong translations of Commits Page

See merge request !12406

Add Simplified Chinese translations of Commits Page

See merge request !12405

Resolve "Unable to disable all restricted visibility levels"

Closes #32408

See merge request !12649

Make filename and path creation compatible with UNIX in web UI

Closes #21362

See merge request !12608

Signed-off-by: Rémy Coutable <remy@rymai.me>

* commit 'a8a4ca17':
  Remove IIFEs around several javascript classes
  Handles realtime with 2 states for environments table
  Revert "Merge branch '18000-remember-me-for-oauth-login' into 'master'"
  Disable Flipper memoizer in tests to avoid transient failures
  fix sidebar padding for full-width items (Time Tracking help)
  Replace 'snippets/snippets.feature' spinach with rspec
  32838 Add wells to admin dashboard overview to fix spacing problems

See https://gitlab.com/gitlab-org/gitlab-ce/issues/34698#note_34276286
for the thorough explanation.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Allow developers to have custom rspec output settings

See merge request !12553

Disable RSpec/BeforeAfterAll and enable RSpec/ImplicitExpect cops

See merge request !12562

Create and use project path helpers that only need a project, no namespace

See merge request !12566

Remove IIFEs around several javascript classes

See merge request !12581

[ci skip]