Kill process if join timed out

Co-authored-by: Mads R. B. Kristensen <madsbk@gmail.com>

Author: pentschev

python/rapidsmpf/rapidsmpf/tests/test_rrun.py

@@ -47,6 +47,11 @@ def _wrapper() -> None:
     proc.start()
     proc.join(timeout=30)
 
+    if proc.is_alive():
+        proc.kill()
+        proc.join()
+        raise RuntimeError("Subprocess timed out after 30 seconds")
+        
     if parent_conn.poll():
         exc = parent_conn.recv()
         if exc is not None: