Flush artist_pending_release*_update in tests

Author: mwiencek

t/lib/t/MusicBrainz/Server/Edit/Release/Create.pm

@@ -125,6 +125,7 @@ sub prepare {
     MusicBrainz::Server::Test->prepare_test_database($c, '+releasestatus');
     MusicBrainz::Server::Test->prepare_test_database($c, <<'SQL');
     SET client_min_messages TO warning;
+    SET CONSTRAINTS ALL IMMEDIATE;
     TRUNCATE release CASCADE;
 SQL
 

t/lib/t/MusicBrainz/Server/Edit/ReleaseGroup/Create.pm

@@ -20,6 +20,7 @@ MusicBrainz::Server::Test->prepare_test_database($c);
 MusicBrainz::Server::Test->prepare_test_database($c, '+releasegrouptype');
 MusicBrainz::Server::Test->prepare_test_database($c, <<'SQL');
     SET client_min_messages TO warning;
+    SET CONSTRAINTS ALL IMMEDIATE;
     TRUNCATE release_group CASCADE;
 SQL