Merge "New pipeline: Separate stability rules for group pruning from group changing" into tm-dev am: baafc8b1 am: e720bca7 am: 8dab79a6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18030065



Change-Id: I46fffc6c325e5e2e1373ca4319557d72eebe945a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>