[Refactor] Rewrite ExecPodCmd with client-go remotecommand package

[MortalHappiness]

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• I had searched in the issues and found no similar feature requirement.

Description

In

kuberay/ray-operator/test/support/core.go

Lines 63 to 71 in 1213d15

	func ExecPodCmd(t Test, pod *corev1.Pod, containerName string, cmd []string) {
	kubectlCmd := []string{"exec", pod.Name, "-n", pod.Namespace, "-c", containerName, "--"}
	kubectlCmd = append(kubectlCmd, cmd...)
	t.T().Logf("Executing command: kubectl %s", kubectlCmd)
	output, err := exec.Command("kubectl", kubectlCmd...).CombinedOutput()
	t.T().Logf("Command output: %s", output)
	t.Expect(err).NotTo(gomega.HaveOccurred())
	}

we called external kubectl command.

It's better to use the remotecommand package from client-go because this can remove dependencies for external command.

Use case

No response

Related issues

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

[MortalHappiness]

@CheyuWu would you want to do this? Because this is found while reviewing #2459

[CheyuWu]

Hi @MortalHappiness I'd like to help with this