This replaces the `process_fine_grained_swiftdeps_with_fingerprints`
helper with a python script that mimics the shell behaviour. Adjust the
generated interface diffs to use unified formats. This allows us to
enable these tests on Windows.
Ensure that we use the correct python to run the python based tools.
This also allows these tools to run on Windows which will not
necessarily associate the python script with an interpreter (python).