delete the busyboxImage and mountTest var and change use imageutils

[thdrnsdk]

What this PR does / why we need it:
delete the busyboxImage,mountTest variable and change everything to use imageutils.GetE2EImage(imageutils.BusyBox), imageutils.GetE2EImage(imageutils.MountTest)

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #67237

Special notes for your reviewer:

/cc @mikedanese
/assign @mikedanese

Release note:

 NONE

[mikedanese]

/approve
/lgtm

[mikedanese]

/ok-to-test

[thdrnsdk]

/test pull-kubernetes-e2e-kops-aws

[thdrnsdk]

/test pull-kubernetes-e2e-kops-aws

[fejta-bot]

/retest
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[krzyzacy]

/retest

[thdrnsdk]

/test pull-kubernetes-e2e-kops-aws

[thdrnsdk]

/retest

[MHBauer]

/lgtm

[MHBauer]

looks like what was asked for was done.

no var referenced, direct calls to imageutils everywhere.

[cjwagner]

/lgtm cancel

[cjwagner]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cjwagner, MHBauer, mikedanese, thdrnsdk

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• test/OWNERS [mikedanese]

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[k8s-github-robot]

Automatic merge from submit-queue (batch tested with PRs 67347, 67307, 67358, 67364, 67385). If you want to cherry-pick this change to another branch, please follow the instructions here.