Bug 43121: Use new dedicated runners for lint jobs

Merge Info

Related Issues

• #43121

Backporting

Timeline

• Immediate: patchset needed as soon as possible
• Next Minor Stable Release: patchset that needs to be verified in nightly before backport
• Eventually: patchset that needs to be verified in alpha before backport
• No Backport (preferred): patchset for the next major stable

Merging

• Merge to tor-browser - !fixups to tor-browser-specific commits, new features, security backports
• Merge to base-browser - !fixups to base-browser-specific commits, new features to be shared with mullvad-browser, and security backports

Change Description

Change the lint jobs to use the new dedicated runners.

There are two big things here:

1. I changed the lint job to use the dedicated Gitlab runners that already have a local copy of the repository;
2. I re-enable the lint jobs on default branches :)

How Tested

No testing required, if CI is green we are happy.