Merge "Expand @FlaggedApi(Flags.FLAG) in *all* API signature files" into main am: 0c787f5b6e am: 4f3dc01ec1 am: 3045dc0633 am: b1ea1a7040

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2765045

Change-Id: Ieb5c0609ee867e2f06a21f08a1d3093507246e9a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>