[chaos] running no faults as a new type of faults (ray-project#41881)

so that we do not run no faults mode for each othar fault mode

Signed-off-by: Lonnie Liu <[email protected]>

.buildkite/pipeline.build_chaos.yml

@@ -10,18 +10,15 @@
         kind delete cluster
       }
       trap cleanup EXIT
-    - echo "--- Preparing chaos testing environment"
+    - echo "--- Preparing testing environment"
     - ./python/ray/tests/chaos/prepare_env.sh
-    # First run: no faults
-    - echo "--- Running the workload without faults"
-    - "./python/ray/tests/chaos/{{matrix.workload}}.sh"
-    # Second run: with faults
-    - kubectl apply -f python/ray/tests/chaos/{{matrix.fault}}.yaml
-    - echo "--- Running the script {{matrix.workload}} with injected fault {{matrix.fault}}"
+    - if [[ "{{matrix.fault}}" != "no_fault" ]]; then kubectl apply -f python/ray/tests/chaos/{{matrix.fault}}.yaml; fi
+    - echo "--- Running {{matrix.workload}}"
     - "./python/ray/tests/chaos/{{matrix.workload}}.sh"
   matrix:
     setup:
       fault:
+        - "no_fault"
         - "chaos_network_delay"
         - "chaos_network_bandwidth"
       workload: