Add Italian translation of Cycle Analytics Page & Project Page & Repository Page

Closes #34544

See merge request !12578

Prevent accidental deletion of protected MR source branch by repeating checks before actual deletion

Closes #34456

See merge request !12574

Revert "Merge branch 'revert-12499' into 'master'"

See merge request !12633

Update prometheus client gem

See merge request !12632

Document that GitLab 9.3 requires the TRIGGER permission on MySQL

Closes #34358

See merge request !12573

no trailing / leading hyphens in CI_COMMIT_REF_SLUG.

Closes #32035

See merge request !11218

Enables the option in user preferences to turn on the new navigation

See merge request !12630

This reverts merge request !12557

# Conflicts:
#   Gemfile.lock

Prevent accidental deletion of protected MR source branch by repeating checks before actual deletion

Instrument Unicorn with Ruby exporter

Closes #33410

See merge request !12115

Add documentation for extended docker configuration options for CI

See merge request !12164

Remove group modal like remove project modal. Closes #33130

Closes #33130

See merge request !12569

Hopefully reduce the rate of this intermittent failure in CI

Closes #31128

See merge request !12567

Strings ready for translation; Pipeline charts

See merge request !12480

CE counterpart of: Namespace license checks for multiple assignees

See merge request !11825

Allow unauthenticated access to the `/api/v4/users` API

Closes #34141

See merge request !12445

wait_for_requests is not needed when AJAX is not in play

Closes #34647

See merge request !12626