pw_env_setup: Get cas from cipd Also remove isolated from CIPD. CAS-RBE is replacing isolated. Change-Id: Idb927f4f2ab80c2d3fa6322ca68a433529ca989a Bug: 380 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/44680 Reviewed-by: Ewout van Bekkum <ewout@google.com> Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com> Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com>
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