Remove Debian9 GCC jobs and related code

Also update some recipe expectations to use job names that currently
exist.

Bug: skia:9632
Change-Id: I35883474a91ffb9fb2ab3b16089c7c80b5df0bd6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/255982
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Ben Wagner aka dogben <benjaminwagner@google.com>
45 files changed