perform-release: Add GitLab support
I haven't tested this code yet. Looking for initial review.
Bug: T321847
How to register an account on GitLab. To prevent spam, new accounts are locked until approved by an admin or the approver bot. You can also file an unlock request to expedite access.
Support: mw:GitLab, how to host a project on GitLab, #wikimedia-gitlab on libera.chat, #GitLab on Phabricator.
I haven't tested this code yet. Looking for initial review.
Bug: T321847