Revert "Merge branch 'winh-mr-widget-no-pipeline' into 'master'"

See merge request !12674

Backports for ee-2112

Closes #34716

See merge request !12671

Add Traditional Chinese in Taiwan translations of Commits Page

See merge request !12407

Generate KUBECONFIG in KubernetesService#predefined_variables

Closes #33360

See merge request !12223

Fix `migration:path` build for "Honor the 'Remember me' parameter for OAuth-based login"

Closes #34713

See merge request !12668

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 reverts merge request !12127

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

https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2112

Fix invalid integer value when more than 1000 commits

Closes #34711

See merge request !12659

* upstream/master: (888 commits)
  Fix Rubocop offense
  Use a previous approach for cycle analytics dummy pipeline
  Allow admin to disable all restricted visibility levels
  Removes file_name_regex from Gitlab::Regex
  Remove IIFEs around several javascript classes
  Update CHANGELOG.md for 9.3.5
  Add ProjectPathHelper cop
  Create and use project path helpers that only need a project, no namespace
  Handles realtime with 2 states for environments table
  Revert "Merge branch '18000-remember-me-for-oauth-login' into 'master'"
  Allow creation of files and directories with spaces in web UI
  Disable Flipper memoizer in tests to avoid transient failures
  Introduce cache policies for CI jobs
  fix sidebar padding for full-width items (Time Tracking help)
  Replace 'snippets/snippets.feature' spinach with rspec
  Rename ci_config_file to ci_config_path
  Add back Pipeline#ci_yaml_file_path due to all the troubles
  Revert change to design. Go back to scrollable page
  Fix cycle analytics tests by making pipeline valid
  Fixes the column widths for the new navigation options in settings
  ...