Add lax rc_presence config to Complement tests

So that we don't get ratelimits while testing the logic of presence in our Complement test suite.

docker/complement/conf/workers-shared-extra.yaml.j2

@@ -86,6 +86,10 @@ rc_invites:
     per_second: 1000
     burst_count: 1000
 
+rc_presence:
+  per_second: 9999
+  burst_count: 9999
+
 federation_rr_transactions_per_room_per_second: 9999
 
 allow_device_name_lookup_over_federation: true