Skip previous version validation in CI

[razo7]

Why we need this PR

Should fix an error when VERSION equals CI_VERSION, so it would skip the previous version validation in CI

Error in post-submit automation

make[1]: Entering directory '/home/go/src/github.com/medik8s/node-maintenance-operator' 924 Error: PREVIOUS_VERSION must be set for the selected VERSION VERSION equals CI_VERSION,

Changes made

Modify the verify-previous-version target so it fails when VERSION doesn't equal CI_VERSION. Similar to SNR PR

[openshift-ci[bot]]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[razo7]

The PR is not affecting the code, but rather the GitHub CI so no need to set the PR as draft

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: clobrano, razo7

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/medik8s/node-maintenance-operator/blob/main/OWNERS)~~ [clobrano,razo7] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[razo7]

/cherry-pick release-0.17

[openshift-cherrypick-robot]

@razo7: new pull request created: #125

In response to [this](https://github.com/medik8s/node-maintenance-operator/pull/124#issuecomment-1994823733): >/cherry-pick release-0.17 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.