Add post-sync hook dispatcher am: be20ea6d7d

Original change: https://googleplex-android-review.googlesource.com/c/platform/tools/repohooks/+/39168876

Change-Id: If1bb6bbb22055f6156e36f8941b6678e347c779d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
Reviewed-on: https://android-review.googlesource.com/c/platform/tools/repohooks/+/4059504