graph/db: thread through reset call-backs

In preparation for handling retries on the source DB side, we thread
through the `reset` call-backs properly so that we can reset appropriate
variables.

graph/db/sql_migration_test.go

@@ -600,6 +600,7 @@ func checkKVPruneLogEntries(t *testing.T, kv *KVStore, sql *SQLStore,
 
 			return nil
 		},
+		func() {},
 	)
 	require.NoError(t, err)
 
@@ -631,7 +632,7 @@ func checkClosedSCIDIndex(t *testing.T, kv kvdb.Backend, sql *SQLStore) {
 		require.True(t, closed)
 
 		return nil
-	})
+	}, func() {})
 	require.NoError(t, err)
 }
 
@@ -663,7 +664,7 @@ func checkZombieIndex(t *testing.T, kv kvdb.Backend, sql *SQLStore) {
 		}
 
 		return nil
-	})
+	}, func() {})
 	require.NoError(t, err)
 }