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

Don't resolve fork relationships for projects pending delete

See merge request !12603

Clean up Gitaly tests

See merge request !12526

- Rather than using an explicit check to turn off authentication for the
  `/users` endpoint, simply call `authenticate_non_get!`.

- All `GET` endpoints we wish to restrict already call
  `authenticated_as_admin!`, and so remain inacessible to anonymous users.

- This _does_ open up the `/users/:id` endpoint to anonymous access. It contains
  the same access check that `/users` users, and so is safe for use here.

- More context: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12445#note_34031323

Also, using page.current_path instead of current_url and move the URL
expectation after the page content expectations.
Signed-off-by: Rémy Coutable <remy@rymai.me>

DeleteMergedBranchesService should not delete protected branches

Closes #34553

See merge request !12624

Optimize creation of commit API by using Repository#commit instead of Repository#commits

See merge request !12623

When deleting all the branches that are merged, the protected branches
should not be deleted.