Get rid of tc-vcs completely

[djmitche]

We no longer use tc-vcs for Gecko, but there are a few stragglers still using it. We have hooks set up to re-generate it periodically, and sometimes those fail. Let's get rid of it.

Bug 1364032 was opened on the same topic, but nobody volunteered to do the work :)

[djmitche]

In discussions at SF there was no disagreement here.

Alternatives were to patch esr52 to not use it anymore and kill it, or just remove caches for everything but esr52 (to prevent accidental use) and wait for the ESR to die in a year.

[djmitche]

@gregarndt I think we finally settled on the last bit (remove all but esr52 caches). Did that get done?

[gregarndt]

Hasn't been done yet. I have to get time to audit what might still be using it somehow. It's one of the remaining pieces for deprecating the scheduler too.

I think if esr52 is the only thing left using it, we can cache that repo and keep the artifact from expiring for a year and turn tc-vcs caching off completely.

[djmitche]

https://bugzilla.mozilla.org/show_bug.cgi?id=1409260 is removing some uses of tc-vcs that remain in trunk.

[djmitche]

https://bugzilla.mozilla.org/show_bug.cgi?id=1435804