Rename disable_goma to disable_rbe and remove goma remnants.

This change needs to land together with the matching infra/config CL:
https://dart-review.googlesource.com/c/sdk/+/358903

Bug: b/296994239
Change-Id: I9b3157b344a0e84a269032a1b0d7eeae92db01b1
Reviewed-on: https://dart-review.googlesource.com/c/recipes/+/357626
Reviewed-by: William Hesse <whesse@google.com>
Commit-Queue: Jonas Termansen <sortie@google.com>
30 files changed