Remove the deprecated `Image` field

[lukasfrank]

Summary

Remove the deprecated Image and ImagePullSecretRef fields from VolumeSpec and MachineSpec. These have been superseded by spec.dataSource.osImage.

Basic example

Before (deprecated):

spec:
  image: ghcr.io/ironcore-dev/gardenlinux/gardener:2150.0.0-kvm

After:

spec:
  dataSource:
    osImage:
      image: ghcr.io/ironcore-dev/gardenlinux/gardener:2150.0.0-kvm

Motivation

The fields are marked as deprecated and the replacement is already in use.

Following projects needs to be updated

• ceph-provider
• ironcore
• libvirt-provider
• machine-controller-manager-provider-ironcore
• docs/e2e
• ironcore in a box
• update table-converter

[coderabbitai]

🔗 Related PRs

#1484 - Remove function SetVolumeUidToAllVolumes() [merged]

---

📝 Issue Planner

_{Check the box below or use the @coderabbitai plan command to generate an implementation plan and prompts that you can use with your favorite coding assistant.}

• Create Plan

---

🧪 Issue enrichment is currently in open beta.

You can configure auto-planning by selecting labels in the issue_enrichment configuration.

To disable automatic issue enrichment, add the following to your .coderabbit.yaml:

issue_enrichment:
  auto_enrich:
    enabled: false

💬 Have feedback or questions? Drop into our discord!

[afritzler]

I would also add a sub task here to update the docs/e2e examples.