Merge "Support third_party.identifier in METADATA files of external packages." into main am: ee7365981e am: 6d17de56fd am: f43586c7f2

Original change: https://android-review.googlesource.com/c/platform/build/+/2795360

Change-Id: I1b62a3d717fbae3b6ba83174ece053749b7ac5f3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>