Safe async event cache (#13308)

Fix race conditions in the async cache invalidation logic, by separating
the async & local invalidation calls and ensuring any async call i
executed first.

Signed off by Nick @ Beeper (@Fizzadar).

synapse/storage/databases/main/monthly_active_users.py

@@ -66,6 +66,7 @@ class MonthlyActiveUsersWorkerStore(RegistrationWorkerStore):
                 "initialise_mau_threepids",
                 [],
                 [],
+                [],
                 self._initialise_reserved_users,
                 hs.config.server.mau_limits_reserved_threepids[: self._max_mau_value],
             )