install: Handle namespaced MediaWiki Installer
These were namespaced in MediaWiki commit 8600ee105c7a.
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.
These were namespaced in MediaWiki commit 8600ee105c7a.