remove sdn's GetNodeCondition

[deads2k]

The rebase (#15234) had to make a copy of GetNodeCondition in pkg/sdn/plugin/subnets.go. The upstream function works against the external version. We should switch to using the external version to match.

[openshift-bot]

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/lifecycle stale

[openshift-bot]

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/lifecycle rotten
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[danwinship]

@pravisankar I think I remember seeing this function get killed off or rewritten in one of your active PRs? (pkg/network/master/subnets.go:GetNodeCondition())

[pravisankar]

Yes, this was fixed by #18758