PYTHON-5784 Add test_periodic_executor.py to synchro converted_tests

The synchronous test was generated but not post-processed (still had
'from test.synchronous import', _IS_SYNC=False, and the async class name)
because test_periodic_executor.py was missing from converted_tests. Add it
and regenerate so the sync file flips _IS_SYNC=True, fixes its imports, and
renames the class to TestPeriodicExecutor.

Author: aclark4life

test/test_periodic_executor.py

@@ -23,14 +23,14 @@
 
 sys.path[0:0] = [""]
 
-from test.synchronous import UnitTest, unittest
+from test import UnitTest, unittest
 
 from pymongo.periodic_executor import PeriodicExecutor
 
-_IS_SYNC = False
+_IS_SYNC = True
 
 
-class TestAsyncPeriodicExecutor(UnitTest):
+class TestPeriodicExecutor(UnitTest):
     def _make_executor(self, interval=30.0, min_interval=0.01, target=None, name="test"):
         if target is None:
 

tools/synchro.py

@@ -253,6 +253,7 @@ def async_only_test(f: str) -> bool:
     "test_monitoring.py",
     "test_mongos_load_balancing.py",
     "test_on_demand_csfle.py",
+    "test_periodic_executor.py",
     "test_pooling.py",
     "test_raw_bson.py",
     "test_read_concern.py",