[skip e2e]Set etcd replica count to 3 for standalone (#22724)

Signed-off-by: Nzhuwenxing <wenxing.zhu@zilliz.com>

tests/python_client/chaos/standalone-values.yaml

@@ -25,7 +25,7 @@ kafka:
   defaultReplicationFactor: 2
 
 etcd:
-  replicaCount: 1
+  replicaCount: 3
   image:
     debug: true
     repository: milvusdb/etcd

tests/python_client/deploy/standalone-values.yaml

@@ -24,7 +24,7 @@ kafka:
   defaultReplicationFactor: 2
 
 etcd:
-  replicaCount: 1
+  replicaCount: 3
   image:
     debug: true
     repository: milvusdb/etcd