[test] Add chaos memory stress test for multiple memory replicas (#17047)

Signed-off-by: NThreadDao <yufen.zong@zilliz.com>

tests/python_client/chaos/chaos_objects/memory_stress/chaos_querynode_memory_stress.yaml

@@ -11,9 +11,10 @@ spec:
       app.kubernetes.io/name: milvus
       app.kubernetes.io/instance: mic-memory
       app.kubernetes.io/component: querynode
-  mode: one
+  mode: all
+  value: "2"
   stressors:
     memory:
       workers: 4
-      size: 512Mi
+      size: 5Gi
   duration: 5m
\ No newline at end of file

tests/python_client/chaos/chaos_objects/memory_stress/chaos_replicas_memory_stress_pods.yaml

+apiVersion: chaos-mesh.org/v1alpha1
+kind: StressChaos
+metadata:
+  name: test-querynode-memory-stress-replica
+  namespace: chaos-testing
+spec:
+  selector:
+    pods:
+      chaos-testing:
+        - mic-replica-milvus-querynode-86c77dd756-rfw8r
+        - mic-replica-milvus-querynode-86c77dd756-wmtdk
+  mode: all
+  stressors:
+    memory:
+      workers: 4
+      size: 85%
+  duration: 3m
\ No newline at end of file