[infra] Do not retry xSAN and Valgrind failures

As a side-effect, explicitly specify MaxAttempts for all "kitchen"
tasks.

Change-Id: Ia0ac825a4364952f0cda678d2cd6462a30a4912e
Reviewed-on: https://skia-review.googlesource.com/c/177883
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
Auto-Submit: Ben Wagner <benjaminwagner@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
2 files changed