Tests: do not set a timeout in Python tests

The Meson test harness handles that for us.

With a custom timeout, meson test -t is not useful (which is
surprising for users) and interactive debugging sessions may
terminate unexepectedly.

tests/lib/testprogramrunner.py

@@ -101,7 +101,6 @@ class TestProgramRunner(unittest.TestCase):
         self,
         *args,
         should_fail=False,
-        timeout_seconds=10,
         wrapper_args=[],
         environment={},
         cwd=None,
@@ -130,7 +129,6 @@ class TestProgramRunner(unittest.TestCase):
         # We want to ensure consistent line endings...
         info = subprocess.run(
             argv,
-            timeout=timeout_seconds,
             stdout=subprocess.PIPE,
             stderr=subprocess.PIPE,
             env=env,