GitLab

Let's not implicitly suggest one can push directly to our repository on Salsa:
it's meant to be a read-only mirror of our canonical repo, and any changes made
directly on Salsa will be overwritten next time someone pushes _anything_ to the
canonical tails.git.

- Salsa because we have merge requests enabled there,
  while we don't have them on gitlab.com (both on purpose).

- Only for "code" work: for now, only the FT is ready to deal
  with merge requests sent on GitLab.

Some teams want to experiment and start using GitLab for code reviews,
let's allow it and see how it goes.

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This reverts commit 74fddd92.

We're testing the usability, not the user.

This reverts commit 9f1c06f9.