Use Warn severity on K8s Event when Node condition is True

[2rs2ts]

If temporary errors generate an Event with a Warn severity, then surely
permanent errors should generate an Event with at least that high of a
severity level.

[k8s-ci-robot]

Hi @2rs2ts. Thanks for your PR.

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[mmiranda96]

The change sounds reasonable to me, but I'm not sure if this can cause issues. I'd suggest to get one more review.
/ok-to-test
/lgtm

[2rs2ts]

/assign @dchen1107

[Random-Liu]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 2rs2ts, mmiranda96, Random-Liu

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