Merge "Stop generating separate rust_test_host." am: 376a19951b am: 26ae6eb466 am: 24a77c9883 am: 5be3d602ec

Original change: https://android-review.googlesource.com/c/platform/development/+/1861786

Change-Id: Id4f5f2c051f4bef89c4cdd9d5c3334485e91c88b