Edited pre-upgrade task to uncordon a node failing to drain

[thegreenbear]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Adds a rescue block to uncordon nodes that failed draining during upgrade.
The goal is to avoid cordoning nodes and leaving them in that state if possible.

Which issue(s) this PR fixes:
Fixes issue described there.

Automatically closes linked issue when PR is merged.:
Fixes #6545

Special notes for your reviewer:
None.

Does this PR introduce a user-facing change?:

None

[k8s-ci-robot]

Hi @thegreenbear. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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.

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[floryut]

/ok-to-test

Agree with you that when this happens in CI and you aren't careful you may have multiple nodes taken away.
/lgtm

[woopstar]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: thegreenbear, woopstar

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