Adds namespace to i18n support

Prepares for i18n

- Only if user can manage project,
- When Auto DevOps is not enabled,
- When project configuration is set to implicit

* zj-auto-devops-table: (365 commits)
  Fix boolean logic with nil value
  Incorporate review
  Updates settings sections to: - create labels for each radio button - remove elements from form section - visually match the mockups
  Adds documentation path to pipelines table in merge request page
  Fix tests
  Update CHANGELOG.md for 9.5.3
  Fix a spec failure dependent on load order
  Ensure `issuables_count_for_state` returns the requested state count
  Shorten the search input for "text with other filters" spec
  Turns out that short name was important, who knew!
  Combine multiple `it` blocks in filter_issues_spec
  Remove more redundant specs in filter_issues_spec
  Re-order top-level `let`s, so that labels are grouped
  Remove unused select_search_at_index helper
  Reduce duplication in RSS feed specs for filter_issues_spec
  Remove the top-level closed issue from filter_issues_spec
  Remove unused labels from filter_issues_spec
  Reduce issues and milestones created in global filter_issues_spec setup
  Clean up the still-way-too-complex filter_issues_spec setup
  Remove an unnecessary issue creation
  ...

- create labels for each radio button
- remove elements from form section
- visually match the mockups

Make comment actions dropdown style consistent

See merge request !13476

[ci skip]

Issue discussions Vue refactor

See merge request !12069

Ensure `issuables_count_for_state` returns the requested state count

Closes #37353

See merge request !14005

We were incorrectly stubbing `Issues::MoveService#execute`. This only
caused a failure when another spec caused it to be autoloaded --
`spec/controllers/projects/issues_controller_spec.rb` in this case.

Add settings for minimum key strength and allowed key type

Closes #17849

See merge request !13712

Remove issuable finder count caching

See merge request !13959

Make pipeline dropdowns consistent

See merge request !13530

changed text banner to include correct mentioning of Auto DevOps and rest of sentence used similarly elsewhere

Reduce duration and complexity of spec/features/issues/filtered_search/filter_issues_spec.rb

See merge request !13973

Optimize notification emails specs

See merge request !13986

Fixes the fly-out navigation flashing in & out

Closes #37022

See merge request !13929

The assignee wasn't important to the test, and shortening the query
allowed us to avoid the "horizontal scroll" failure without having to
stub the `sidebar_collapsed?` helper.

We now document that fact.

We were essentially testing "all of the filters" four times, so now we
just do it once at the top level.

Three issues were only used in one test each, and one milestone with its
accompanying issue were only used in one test, so we now scope those
locally.