Fix missing ONVIF events when switching from PullPoint to webhooks

We now let the PullPoint subscription expire instead of explicitly
unsubscribing when pausing the subscription. We will still unsubscribe
it if Home Assistant is shutdown or the integration is reloaded

Some cameras will cancel ALL subscriptions when we do an unsubscribe
so we want to let the PullPoint subscription expire instead
of explicitly cancelling it.

homeassistant/components/onvif/event.py

@@ -289,7 +289,13 @@ def async_pause(self) -> None:
         """Pause pullpoint subscription."""
         LOGGER.debug("%s: Pausing PullPoint manager", self._name)
         self.state = PullPointManagerState.PAUSED
-        self._hass.async_create_task(self._async_cancel_and_unsubscribe())
+        # Cancel the renew job so we don't renew the subscription
+        # and stop pulling messages.
+        self._async_cancel_pullpoint_renew()
+        self.async_cancel_pull_messages()
+        # We do not unsubscribe from the pullpoint subscription and instead
+        # let the subscription expire since some cameras will terminate all
+        # subscriptions if we unsubscribe which will break the webhook.
 
     @callback
     def async_resume(self) -> None: