Check RayCluster ray job submit can successfully create a job by running it in the head Pod

[MortalHappiness]

This is a subtask of #2310. See the parent issue for more information.

Implementation Details

• Implement the EasyJobRule here with Golang.
  

  kuberay/tests/framework/prototype.py

  Lines 247 to 253 in e5dc0f8

  	class EasyJobRule(Rule):
  	"""Submit a very simple Ray job to test the basic functionality of the Ray cluster."""
  	def assert_rule(self, custom_resource=None, cr_namespace='default'):
  	headpod = get_head_pod(cr_namespace)
  	headpod_name = headpod.metadata.name
  	pod_exec_command(headpod_name, cr_namespace,
  	"python -c \"import ray; ray.init(); print(ray.cluster_resources())\"")

• Implement this check as a utility function so that other tests can use it
• Add the test after this line
  

  kuberay/ray-operator/test/sampleyaml/raycluster_test.go

  Line 90 in e5dc0f8

  test.Eventually(GetWorkerPods(test, rayCluster), TestTimeoutShort).Should(gomega.WithTransform(AllPodsRunningAndReady, gomega.BeTrue()))

[CheyuWu]

Hi @MortalHappiness I'd like to help with this