Bug 40595 (and others): The big MR for 102

This MR moves Tor Browser to the first Firefox 102 branch, updates all the needed toolchains, and tries to remove the dependency on GCC on Windows whenever possible.

Fixes: #29318 (closed), #29321 (closed), #29322 (closed), #40409 (closed), #40591 (closed), #40592 (closed), #40595 (closed), tor-browser#41152 (closed).

Currently drafted because blocked on !501 (merged) (it includes also its commit, but in case of change I'll rebase it to main).