update kubevirt cloud provider rebased

[toschneck]

• update kubevirt cloud providers docs
• copy change to 2.30

rebased version of #1874

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[kubermatic-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
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/lifecycle rotten

[kubermatic-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
Rotten issues close after an additional 30d of inactivity.

If this issue is safe to close now please do so with /close.

/lifecycle rotten