Introduce "Reader" abstraction for project import"

Closes #208870

See merge request gitlab-org/gitlab!26481

 - reader can read JSON files for further processing
 - its only implementation would be to read legacy(fat) JSON files
 - split Project::TreeLoader into dedup_legacy_reader and legacy_reader

Fixes stop_review job upon expired artifacts from previous stages

See merge request gitlab-org/gitlab!27258

Move #auto_resolve_prometheus_alert methods from EE to CE

Closes #210524

See merge request gitlab-org/gitlab!27335

Remove unnecessary noop dependencies

See merge request gitlab-org/gitlab!27291

Add redirects to telemetry

See merge request gitlab-org/gitlab!27377

Restructure Vale configuration

See merge request gitlab-org/gitlab!27378

Reduce svg icon requests during rendering

Closes #31734

See merge request gitlab-org/gitlab!26974

Move diffs/components/app_spec to Jest

See merge request gitlab-org/gitlab!27234

- Also make Karma's version a proxy to this

Update policy docs

See merge request gitlab-org/gitlab!26993

- Final patch release for 12.0 is 12.0.12, not 12.0.9
- Clarify requirement to stop as at 12.0.x
- Make instruction broader to address future x.0.x releases.

Fixing YML in review app docs and screenshot

See merge request gitlab-org/gitlab!27340

- There's a screenshot
https://docs.gitlab.com/ee/ci/review_apps/#enable-review-apps-button
with incorrect YML. The incorrect YML was also inside the application.
This commit fixes the YML and the screenshot so that it will pass the
CI linting.

Update license compliance policy classifications text in the UI and refactor

See merge request gitlab-org/gitlab!27058

Fix some stylelint errors in ide.scss

See merge request gitlab-org/gitlab!26448

Monaco related CSS overrides can should be in a separate file to
reduce the number of stylelint errors in the main file.

Refactor mount hooks for license compliance

See merge request gitlab-org/gitlab!27274

Snippets access rights checking single file constraint

See merge request gitlab-org/gitlab!26551

Add tooltip to file tree

Closes #205399

See merge request gitlab-org/gitlab!27158

Document Puma setting with rugged in nfs doc

See merge request gitlab-org/gitlab!27310

Update docs to include a note about limitation of visual reviews

See merge request gitlab-org/gitlab!27330

Add RSpec stdout metadata

See merge request gitlab-org/gitlab!27128

Ties a capybara screenshot to a rspec failing test

Merge branch '209277-introduce-a-feature-flag-for-resolve-notifications-for-when-pipelines-are-fixed' into 'master'

Introduce a feature flag for fixed pipeline notifications

Closes #209277

See merge request gitlab-org/gitlab!26682

Introduce a FF "ci_pipeline_fixed_notifications" for
Pipeline Fixed notification.

Docs change: move Roadmaps to Premium

See merge request gitlab-org/gitlab!26996

Move docs from event tracking to telemetry

See merge request gitlab-org/gitlab!26746

Ensure freshness of settings with project creation

Closes gitaly#2147

See merge request gitlab-org/gitlab!27156

Treat rename as single file operation.
We only check the tip commit to avoid N+1 query.

BaseChecker uses validate instead of exec