Add test verification to ansible-test. (#22636)

* Add unified git diff parser.
* Add metadata and diff handling.
* Add test confidence/verification to bot output.

test/runner/test.py

@@ -163,6 +163,9 @@ def parse_args():
                       action='store_true',
                       help='analyze code coverage when running tests')
 
+    test.add_argument('--metadata',
+                      help=argparse.SUPPRESS)
+
     add_changes(test, argparse)
     add_environments(test)