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## What this PR does
### Release note
<!-- Write a release note:
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```release-note
[vm-default-images] Added package that brings set of images that can be used clusterwide
[vm-disk] Updated source "image" for prettier dropdown selection
[vm-disk] Added new source for vm-disk called disk - to use as source vm-disk from same namespace.
```
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Clone VM disks by specifying an existing vm-disk as the source.
* Global default image collection and chart to publish pre-provisioned
images.
* **UI**
* Forms provide selectable lists for default images and existing VM
disks.
* **Migration**
* Migration to rename existing image DataVolumes to the new
default-images naming and bumped migration version.
* **Documentation**
* VM disk docs and README updated to reflect image sourcing and cloning.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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