[Bug] Wrong default value for cmd flags

[machichima]

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• I searched the issues and found no similar issues.

KubeRay Component

kubectl-plugin

What happened + What you expected to happen

Related to: #3801

1. Should be ""
   

   kuberay/kubectl-plugin/pkg/cmd/log/log.go

   Line 151 in 94d37f2

   cmd.Flags().StringVar(&options.outputDir, "out-dir", options.outputDir, "directory to save the logs to")

2. Can directly use util.RayVersion
   

   kuberay/kubectl-plugin/pkg/cmd/create/create_workergroup.go

   Line 95 in 94d37f2

   cmd.Flags().StringVar(&options.image, "image", fmt.Sprintf("rayproject/ray:%s", options.rayVersion), "container image to use")

   
   

   kuberay/kubectl-plugin/pkg/cmd/job/job_submit.go

   Line 172 in 94d37f2

   cmd.Flags().StringVar(&options.image, "image", fmt.Sprintf("rayproject/ray:%s", options.rayVersion), "container image to use")

For 2., an improvement can be update the image if user specify ray version that's different from default (now there can be some mismatch). Like what we did in create_cluster.go

kuberay/kubectl-plugin/pkg/cmd/create/create_cluster.go

Lines 167 to 170 in 94d37f2

	// If the image is the default but the ray version is not the default, set the image to use the specified ray version
	if options.image == defaultImageWithTag && options.rayVersion != util.RayVersion {
	options.image = fmt.Sprintf("%s:%s", defaultImage, options.rayVersion)
	}

Reproduction script

N/A

Anything else

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

[HsiaoHungKai]

Can I take this one?

[machichima]

Yes! Please go ahead @HsiaoHungKai . Thank you!