[skip ci] Add rootcoord network partition chaos (#8149)

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

tests/python_client/chaos/chaos_objects/chaos_rootcoord_network_partition.yaml

+apiVersion: chaos-mesh.org/v1alpha1
+kind: NetworkChaos
+metadata:
+  name: test-rootcoord-network-partition
+  namespace: chaos-testing
+spec:
+  action: partition
+  mode: all
+  selector:
+    namespaces:
+      - chaos-testing
+    labelSelectors:
+      app.kubernetes.io/instance: milvus-chaos
+      app.kubernetes.io/name: milvus
+  duration: 5m
+  direction: both
+  target:
+    selector:
+      namespaces:
+        - chaos-testing
+      labelSelectors:
+        app.kubernetes.io/instance: milvus-chaos
+        app.kubernetes.io/name: milvus
+        component: rootcoord
+    mode: one

tests/python_client/chaos/chaos_objects/testcases.yaml

@@ -160,6 +160,18 @@ Collections:
           index: fail
           search: fail
           query: fail
+  -
+    testcase:
+      name: test_rootcoord_network_partition
+      chaos: chaos_rootcoord_network_partition.yaml
+      expectation:
+        cluster_1_node:
+          create: fail
+          insert: fail
+          flush: fail
+          index: fail
+          search: fail
+          query: fail
   -
     testcase:
       name: test_querynode_cpu100p