add unit test for bp2build allowlist am: cc51843e am: d09556a6 am: ebe9822b

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2047750



Change-Id: I9f2e4bdcbdf791c68029ea465cd268c9296f8842
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>