fix: remove legacy notification saving to address intermittent fails

We don't actually need to test legacy notification saving here, since
this is supposed to test monthly table rotation. The test would fail
randomly based on whether the channel UUID started with the first two
characters being less than '01' as fetch_timestamp_messages requires
that to locate them.

Closes #878

autopush/tests/test_integration.py

@@ -1263,8 +1263,7 @@ def test_webpush_monthly_rotation(self):
         # Send in a notification, verify it landed in last months notification
         # table
         data = uuid.uuid4().hex
-        with self.legacy_endpoint():
-            yield client.send_notification(data=data)
+        yield client.send_notification(data=data)
         ts, notifs = yield deferToThread(lm_message.fetch_timestamp_messages,
                                          uuid.UUID(client.uaid),
                                          " ")
@@ -1366,8 +1365,7 @@ def test_webpush_monthly_rotation_prior_record_exists(self):
         # Send in a notification, verify it landed in last months notification
         # table
         data = uuid.uuid4().hex
-        with self.legacy_endpoint():
-            yield client.send_notification(data=data)
+        yield client.send_notification(data=data)
         _, notifs = yield deferToThread(lm_message.fetch_timestamp_messages,
                                         uuid.UUID(client.uaid),
                                         " ")