Merge "Add missed TEST_MAPPINGs" am: 8a2f224db3 am: 251a34db9c am: 1702210f83 am: 8d99385643

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/grpcio-sys/+/1924517

Change-Id: Ia39017fc49e2591ca7cbda35452f1dfe567b60d5