Support kubectl alpha debug default image imagePullPolicy set by the image tag

[wawa0210]

What type of PR is this?

/kind bug
/kind feature

What this PR does / why we need it:

The default imagePullPolicy of kubectl alpha debug is PullIfNotPresent rather than set according to whether the image tag is :latest.
This will cause the latest image to be executed without pull, if there is already a :latest image locally

Which issue(s) this PR fixes:

Fixes #92383

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Ephemeral containers now apply the same API defaults as initContainers and containers

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[wawa0210]

@verb
Can you help me review this pr, thank you very much

At present, there is only one method in the entire k8s to set imagePullPolicy according to the mirror tag

kubernetes/pkg/apis/core/v1/defaults.go

Lines 79 to 90 in 7ceac2b

	func SetDefaults_Container(obj *v1.Container) {
	if obj.ImagePullPolicy == "" {
	// Ignore error and assume it has been validated elsewhere
	_, tag, _, _ := parsers.ParseImageName(obj.Image)
	// Check image tag
	if tag == "latest" {
	obj.ImagePullPolicy = v1.PullAlways
	} else {
	obj.ImagePullPolicy = v1.PullIfNotPresent
	}
	}

But the code in kubectl is not allowed to import k8s.io/kubernetes/pkg/apis/core/v1 directly, do you have any suggestions?

[dims]

/assign @verb

[verb]

Thanks for the fix!

/lgtm
/retest

[zhouya0]

/lgtm

[wawa0210]

/test pull-kubernetes-bazel-test

[zhouya0]

/lgtm

[wawa0210]

@liggitt @dims

Can you help review this pr?

[verb]

/lgtm

[dims]

/assign @sjenning @derekwaynecarr

[liggitt]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: liggitt, wawa0210

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