Removed the redundant cluster_known_nodes call

Signed-off-by: Hanxi Zhang <hanxizh@amazon.com>

Author: hanxizh9910

tests/unit/cluster/cli.tcl

@@ -284,16 +284,6 @@ test {Migrate the last slot away from a node using valkey-cli} {
             fail "Cluster doesn't stabilize"
         }
 
-        # Ensure all node IDs are propagated
-        wait_for_condition 1000 50 {
-            [CI 0 cluster_known_nodes] == 4 &&
-            [CI 1 cluster_known_nodes] == 4 &&
-            [CI 2 cluster_known_nodes] == 4 &&
-            [CI 3 cluster_known_nodes] == 4
-        } else {
-            fail "Cluster gossip hasn't propagated all node IDs"
-        }
-
         set newnode_r [valkey_client -3]
         set newnode_id [$newnode_r CLUSTER MYID]