Add disabled nestloop and mergejoin parameters to stabilize look-a-like test,

besides add two additional cases where look-a-like should not be applied.

Author: Alena Rybakina

aqo.c

@@ -308,7 +308,7 @@ _PG_init(void)
 PGC_USERSET,
 0,
 NULL,
-lc_assign_hook,
+NULL,
 NULL);
 
 prev_shmem_startup_hook = shmem_startup_hook;