This change switches to using python scripts directly in a-c and a-s repositories, which achieves two things:
- we avoid overhead of running through a-c and a-s gradle's build phases, which is quite significant
- all of the logic for checking if projects are up-to-date or need to be republished now lives in those projects

End result is that local fenix builds now incur zero costs if there are no changes in a-c or a-s,
and if there are _any_ changes at all, the corresponding project is reliably recompiled and republished.