Merge "[aapt2] Generate @FlaggedApi annotations" into main am: 5f951b7f6c

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2783692

Change-Id: I7ec20553e60748c6790dbe4e8b9951cf83e1455d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>