make mutating and validating admission controllers consistent

[hzxuzhonghu]

func mutateSpec(tasks []v1alpha1.TaskSpec, basePath string) (patch []patchOperation) {
	for index := range tasks {
		// add default task name
		taskName := tasks[index].Name
		if len(taskName) == 0 {
			tasks[index].Name = v1alpha1.DefaultTaskSpec
		}
	}
	patch = append(patch, patchOperation{
		Op:    "replace",
		Path:  basePath,
		Value: tasks,
	})

	return patch
}

If user not specify the task names of a job, default will be used in mutating stage, but the validating admission controller will reject the Job creation because of duplicate task names.

[TommyLike]

Task name can be indexed when mutating.

[hzxuzhonghu]

Not the same thing, for jobs with multi tasks without name specified, they all set default, so the validation will fail it for the reason Duplicate task names

[TommyLike]

I mean we can index the default task name in mutate webhook