Add priority field to prevent early shutdown

[CoreyCook8]

Based on the issue described here : kubernetes/kubernetes#133442

priorityClassName is currently ignored by Kubelet for static pod files so setting this value has no impact on the gracefulShutdown order causing the static pods to start to be killed as soon as shutdown begins.

To prevent this we must set priority explicitly

[openshift-ci]

Hi @CoreyCook8. Thanks for your PR.

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: CoreyCook8
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[CoreyCook8]

👋 @ingvagabund could I get an ok-to-test on this so we can merge when the E2E test PR merges in? 🙏

[CoreyCook8]

👋 @ingvagabund could I get an ok-to-test on this so we can merge when the E2E test PR merges in? 🙏

@ingvagabund @deads2k ping on this 🙏