Add diff logic to python format subcommand (#15156)

* Add diff logic to python format subcommand

* Update test

* Add in filter per format-c

* fix tests

* Update new workflow

lib/python/qmk/tests/test_cli_commands.py

@@ -81,9 +81,9 @@ def test_hello():
 
 
 def test_format_python():
-    result = check_subcommand('format-python', '--dry-run')
+    result = check_subcommand('format-python', '-n', '-a')
     check_returncode(result)
-    assert 'Python code in `bin/qmk` and `lib/python` is correctly formatted.' in result.stdout
+    assert 'Successfully formatted the python code.' in result.stdout
 
 
 def test_list_keyboards():