Refactor ansible-test config classes. (#26505)

* Move Config classes from executor.py to config.py.
* Move Environment and Test config to config.py.
* Move Coverage/CoverageReport Config to config.py.
* Clean up type hints.

test/runner/lib/core_ci.py

@@ -19,11 +19,14 @@ from lib.util import (
     ApplicationError,
     run_command,
     make_dirs,
-    EnvironmentConfig,
     display,
     is_shippable,
 )
 
+from lib.config import (
+    EnvironmentConfig,
+)
+
 AWS_ENDPOINTS = {
     'us-east-1': 'https://14blg63h2i.execute-api.us-east-1.amazonaws.com',
     'us-east-2': 'https://g5xynwbk96.execute-api.us-east-2.amazonaws.com',