Bug 40587: Migrate tor-browser-build configs from gitolite to gitlab repos

We need to wait until goptlib is migrated, and we will need to update the snowflake build script as its sources hardcode the gitolite repo

Closes #40587 (closed)

assigned to @richard

requested review from @dan

approved this merge request

will push once a tesbuild completes

(testbuild succceeded)

merged

changed the description

mentioned in merge request !534 (merged)