Make auto-cancelling pending pipelines on by default

Closes #30656

See merge request !11023

Add indices for auto_canceled_by_id for PostgreSQL

Closes #31233

See merge request !11034

* upstream/master: (224 commits)
  Added balsamiq jasmine integration test
  Add support for deltas_only under Gitaly
  Codestyle
  Update CHANGELOG.md for 9.1.4
  Update CHANGELOG.md for 9.1.4
  Update CHANGELOG.md for 9.1.4
  Update CHANGELOG.md for 9.1.4
  Minor cosmetic fixes in hooks admin screen
  Documentation for repository_update_events
  Changelog
  Update SystemHooks API to expose and handle new repository_update_events
  Make the new repository_update_events configurable in System Hooks UI
  Added repository_update hook
  Wait for requests after each Spinach scenario instead of feature
  Remove trailing comma in dependency linker to satisfy Rubocop
  Fix specs
  New branch new mr docs
  Relax rake backup regex to handle CE and EE RCs
  Fix conflict resolution from corrupted upstream
  Removed all instances of Object.assign by using es6 classes, also includes some …
  ...

Allow numeric values in gitlab-ci.yml

Closes #30017

See merge request !10607

Fix adding defaults for concurrent column renames

See merge request !11335

Added balsamiq jasmine integration test

Closes #31889

See merge request !11257

add username field to push webhook

Closes #32136

See merge request !11272

Fix typo in code snippet to match text below

See merge request !11101

Fix the GitLab EE link

See merge request !11021

fix $CI_JOB_ID variable

See merge request !10966

Fetch commit deltas from Gitaly

Closes gitaly#199

See merge request !11122

Ensure schedule_form and schedules_index both utilize common_vue bundle

See merge request !11274

Closes gitaly#199

Backport New SystemHook: `repository_update`

Closes #26325

See merge request !11140

[ci skip]

[ci skip]

Wait for requests after each Spinach scenario instead of feature

See merge request !11349

[ci skip]

[ci skip]

Link to a case where we can't support MySQL

Closes #32181

See merge request !11334

Remove trailing comma in dependency linker to satisfy Rubocop

See merge request !11348

Add fixed positioning to top level navbar

Closes #30975

See merge request !10751

Relax rake backup regex to handle CE and EE RCs

See merge request !11345

Fix conflict resolution from corrupted upstream

Closes gitlab-ee#2128

See merge request !11298