Check if an installed file exists and report error if not.

So far there is only one case happened in b/277039235 that an installed file in that product is moved to another directory in LOCAL_POST_INSTALL_CMD. The team agreed to convert to Android.bp, but better to add a check and report the error.

Bug: 277039235
Test: m sbom
Test: build/soong/tests/sbom_test.sh
Change-Id: I9a2302ced6dd605e60e54c49a8778426444dcc4f