Hetzner(feat): add option to set nodepool-specific image IDs

[pat-s]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Allows setting nodepool-specific image IDs instead of sharing a global default across all nodepools.

Which issue(s) this PR fixes:

• Hetzner autoscaler can`t provision windows and linux nodes in one cluster #7537 (comment)
• Moving to LeapMicro kube-hetzner/terraform-hcloud-kube-hetzner#1628 (comment)

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Yes

## Hetzner
- Added the option to specify nodepool-specific image IDs

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: pat-s / name: Patrick Schratz (77cb4c8, 008a3b9)

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[k8s-ci-robot]

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[jackfrancis]

/assign @apricote

[pat-s]

@apricote Sorry for the ping, just asking if this PR made it to your backlog via the assignment?

[lukasmetzner]

@apricote Sorry for the ping, just asking if this PR made it to your backlog via the assignment?

Hey, apologies for the long wait. We kinda missed it. I will have a look at the PR.

[lukasmetzner]

/lgtm

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In response to this:

/lgtm

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[apricote]

Thank you @pat-s

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: apricote, pat-s

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

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