test: Add test case for DurationFrom

[mayooot]

What type of PR is this?

/kind feature
/kind cleanup

What this PR does / why we need it:

This PR adds additional test cases for the DurationFrom feature to enhance test coverage.

There is a second use of DurationFrom in the kwok document: specifying a specific time using a string type, but there is no test in the code for this case.

DurationFrom is the expression used to get the value. If it is a time.Time type, getting the value will be minus time.Now() to get DurationMilliseconds If it is a string type, the value get will be parsed by time.ParseDuration.

link: https://kwok.sigs.k8s.io/docs/generated/apis/#kwok.x-k8s.io/v1alpha1.ExpressionFromSource

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[k8s-ci-robot]

Hi @mayooot. Thanks for your PR.

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[wzshiming]

/ok-to-test

[mayooot]

/retest

[wzshiming]

https://prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/kubernetes-sigs_kwok/1285/pull-kwok-verify-main/1866677015533326336

Please format it and squash all commits

 		},
 		{
 			args: args{
-				src:   format.Ptr(".metadata.annotations[\"custom-duration\"]"),
+				src: format.Ptr(".metadata.annotations[\"custom-duration\"]"),
 				v: corev1.Pod{
 					ObjectMeta: metav1.ObjectMeta{
 						Annotations: map[string]string{"custom-duration": "7s"},

[wzshiming]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mayooot, wzshiming

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[mayooot]

/kind cleanup

[wzshiming]

/release-note-none