perf: optimizes check for updated machineconfigpool

[nestoracunablanco]

This optimization is particularly beneficial when running the test scripts a second time within the same cluster.

What this PR does / why we need it: s390x enablement

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 #

Special notes for your reviewer:

Release note:

NONE

[openshift-ci]

Hi @nestoracunablanco. Thanks for your PR.

I'm waiting for a kubevirt member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[0xFelix]

/ok-to-test

[nestoracunablanco]

/retest

[0xFelix]

/approve

[nestoracunablanco]

@0xFelix @fossedihelm @geetikakay anything else you need for a lgtm label?

[0xFelix]

@ksimon1 PTAL

[ksimon1]

/lgtm
/approve

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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