force `subprocess.run` to check return code is 0

In general, this should help to capture unintentional errors.

Where the change has created failures, they have been fixed. (Mostly because the git repository that was looked for was missing.)

mpsd-software-environment.py

@@ -267,6 +267,7 @@ def create_dir_structure(mpsd_release: str, script_dir: Path) -> None:
                 )
             run(["git", "pull"])
 
+
 def get_release_info(mpsd_release: str, script_dir: Path) -> Tuple[str, str, List[str]]:
     """
     Get information about the specified release.