Fix Autoscaling for worker nodes with invalid ProviderID

[maksim-paskal]

What type of PR is this?

/kind bug

Which issue(s) this PR fixes:

Fixes #6716

Special notes for your reviewer:

This change fixes a bug that arises when the user's cluster includes worker nodes not from Hetzner Cloud, such as a Hetzner Dedicated server or any server resource other than Hetzner. It also corrects the behavior when a server has been physically deleted from Hetzner Cloud.

Does this PR introduce a user-facing change?

Fixed an issue where the Hetzner provider breaks when nodes from other providers are present

[k8s-ci-robot]

Hi @maksim-paskal. Thanks for your PR.

I'm waiting for a kubernetes 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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[apricote]

/ok-to-test
/lgtm

[apricote]

Can you add a changelog entry to the PR description?

#### Does this PR introduce a user-facing change?

```release-note
Fixed an issue where the Hetzner provider breaks when nodes from other providers are present
```

Once this is merged, we should also port it all all current release branches (1.27-1.29). If you want you can do it, otherwise I will take care of it.

[maksim-paskal]

add release-notes, please port this commit to all available versions.

[apricote]

/approve

[apricote]

Thank you very much!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: apricote, maksim-paskal

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• cluster-autoscaler/cloudprovider/hetzner/OWNERS [apricote]

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[apricote]

Backports:

• [v1.29][Hetzner] Fix Autoscaling for worker nodes with invalid ProviderID #6720
• [v1.28][Hetzner] Fix Autoscaling for worker nodes with invalid ProviderID #6721
• [v1.27][Hetzner] Fix Autoscaling for worker nodes with invalid ProviderID #6722