[infra] Switch from Isolate to RBE-CAS

Update gen_tasks_logic to match the main branch; it was very out of
date. This required renaming some jobs and adding others.

Bug: skia:10883
Change-Id: I749c24c62fd50175d2ed2e6142ca0fed829b3e1b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/341676
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-by: Weston Tracey <westont@google.com>
62 files changed