test_qcomgpsd: subtest the gps_runtime scenarios (#31485)

* subtest this

* runtime

---------

Co-authored-by: Comma Device <device@comma.ai>
old-commit-hash: c2b9f7163a

system/qcomgpsd/tests/test_qcomgpsd.py

@@ -68,6 +68,7 @@ class TestRawgpsd(unittest.TestCase):
 
   def test_turns_off_gnss(self):
     for s in (0.1, 1, 5):
+      with self.subTest(runtime=s):
         managed_processes['qcomgpsd'].start()
         time.sleep(s)
         managed_processes['qcomgpsd'].stop()