Centralize METADATA.toml parsing in the test suite (#9534)

tests/mypy_test.py

@@ -26,14 +26,13 @@ from typing_extensions import Annotated, TypeAlias
 
 import tomli
 
+from parse_metadata import PackageDependencies, get_recursive_requirements
 from utils import (
     VERSIONS_RE as VERSION_LINE_RE,
-    PackageDependencies,
     VenvInfo,
     colored,
     get_gitignore_spec,
     get_mypy_req,
-    get_recursive_requirements,
     make_venv,
     print_error,
     print_success_msg,