[automerger skipped] Remove older RBE tooling versions that are no longer used am: 55f2a906d1 -s ours

am skip reason: Change-Id Ia13552e5c698f036679e1f2db417b2f6871d4152 with SHA-1 5ccb7a61f0 is in history

Change-Id: I38f93c5b5412f4472c6180e66b718e7a45e72897