allow embedded cluster node labels with dns prefix #4514
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What this PR does / why we need it:
This PR modifies the embedded cluster node label sanitization so that node labels with DNS prefixes are supported.
Ref: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#syntax-and-character-set
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
Steps to reproduce
Does this PR introduce a user-facing change?
Does this PR require documentation?