GitLab is used only for code review, issue tracking and project management. Canonical locations for source code are still https://gitweb.torproject.org/ https://git.torproject.org/ and git-rw.torproject.org.
In the past we archived bridge pool assignments in CollecTor, but we don't do that anymore. It would be nice to do it again. This could be combined with the implementation of legacy/trac#29448 (moved).