CE backport for changes in EE MR 14746

See merge request gitlab-org/gitlab-ce!30944

All the changes done to files that are also inside CE and need to be
ported.

Use NotesFinder to fetch notes in module IssuableActions

Closes #52123

See merge request gitlab-org/gitlab-ce!29733

Update ruby version in readme file to match .ruby-version

See merge request gitlab-org/gitlab-ce!31185

Redirect project.wiki.git to project wiki home

See merge request gitlab-org/gitlab-ce!31085

Fix spec that has broken master

Closes #65193

See merge request gitlab-org/gitlab-ce!31198

Otherwise capybara hits ambiguous match.

Add frozen_string_literal to spec/lib (part 1)

See merge request gitlab-org/gitlab-ce!31130

Make pipeline failure Slack notifications prettier and more informative

Closes #32495

See merge request gitlab-org/gitlab-ce!27683

Extract resource_label_events API shared examples

See merge request gitlab-org/gitlab-ce!31156

Refactor elements used by ci_variable and ::CICD

See merge request gitlab-org/gitlab-ce!30922

Many elements defined in the QA framework in ci_variable.rb
call elements and methods that are not framework specific.

Fix these issues, as well as use data-qa-selector s

Add frozen_string_literal to spec/factories

See merge request gitlab-org/gitlab-ce!31129

fix: updates labels to include units in metrics

Closes #59325

See merge request gitlab-org/gitlab-ce!30330

This MR updates the y_label values and the label
values in common_metrics and cluster_metrics to
append the units of measurement to the labels.

Fix pid discovery for Unicorn in PidProvider

See merge request gitlab-org/gitlab-ce!31056

Remove code related to object hierarchy and MySQL

Closes #65056 and #65055

See merge request gitlab-org/gitlab-ce!31095

Find build by sha from ref

Closes #64534 and #45697

See merge request gitlab-org/gitlab-ce!30843

Remove fallback to deployment_platform_cluster in `DeploymentMetrics`

See merge request gitlab-org/gitlab-ce!31126

Add severity for vulnerabilities

See merge request gitlab-org/gitlab-ce!31146

(CE Port) Add MR table component for Productivity Analytics

See merge request gitlab-org/gitlab-ce!30975

Fix error rendering submodules in MR diffs when there is no .gitmodules

See merge request gitlab-org/gitlab-ce!31162

Prefer `flat_map` over `map` + `flatten`

See merge request gitlab-org/gitlab-ce!31144

Convert several occurrences of `map` + `flatten` to
`flat_map` where applicable.

Without this change, we get a NoMethodError on nil

Add development documentation on label filtering

Closes #49651

See merge request gitlab-org/gitlab-ce!30741

Update dependency @gitlab/ui to ^5.9.0

See merge request gitlab-org/gitlab-ce!31153

The GitLab UI update changed the spinner selector from `spinner` to
`gl-spinner`, so we need to update it, so that our tests won't fail.

Extract Auto DevOps deploy functions in a base image

Closes #50286

See merge request gitlab-org/gitlab-ce!30404

Adds event enum column to DesignsVersions join table

See merge request gitlab-org/gitlab-ce!30745

Support indentation in the markdown editor

Closes #25070

See merge request gitlab-org/gitlab-ce!28914

It will be hooked up to the markdown editor later

Add spec for concern IssuableActions

Add shared samples for discussions endpoint

Add schema validations for discussions

Fix rubocop style issue

Make target assignable

Use new possibility to provide target

Ensure Warden triggers after_authentication callback

See merge request gitlab-org/gitlab-ce!31138

By not triggering the callback:
- ActiveSession lookup keys are not cleaned
- Devise also misses its hook related to session cleanup

CE port of "Stablize editing scope label spec - retry if dropdown is not visible"

See merge request gitlab-org/gitlab-ce!31145