Spanify: Update the script to handle Siso

On newly chromium checkout, siso is being used by default instead of
goma. Update the script to support it.

This patch:
- Specify whether siso should be used (enabled)
- Detect siso build failure.

Bug: 380783672
Change-Id: I1bc75ba04dea1d8f592150021c466776c6edece7
Fixed: 380783672
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6049414
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Stephen Nusko <nuskos@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1388086}