feat(vm): allow detach cloud-init volumes without restart

[loktev-d]

Description

Allows removing a cloudinit initialization script from a running virtual machine without a restart. Removing .spec.provisioning (type UserData/UserDataRef) is now applied live: the cloud-init disk is hot-detached from the running VM, after which the referenced Secret can be deleted.'

Module-side changes:

• vmchange comparator (compareProvisioning): removal of a cloudinit provisioning block is downgraded to ActionApplyImmediate (no restart). Any add or change of provisioning, still require a restart (ActionRestart), because that data is consumed only at VM startup.
• kvbuilder.KVVM.SetProvisioning + new RemoveDisk: the KubeVirt VM template now correctly drops the cloud-init/sysprep disk and volume when provisioning is removed or the provisioning type is switched. This also fixes a latent bug where a stale provisioning disk was left in the template on removal.

Why do we need it, and what problem does it solve?

What is the expected result?

1. Create a running VM with provisioning.type: UserData (or UserDataRef).
2. Remove the .spec.provisioning block.
3. The VM stays Running (same VMI, no restart), the AwaitingRestartToApplyConfiguration condition does not appear, the cloudinit disk/volume disappears from the running VMI, and a UserDataRef Secret can be deleted.
4. Removing a Sysprep provisioning block instead sets AwaitingRestartToApplyConfiguration: True and keeps the disk until the VM is restarted.

Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in the Kubernetes cluster manually.

Changelog entries

section: feature
type: vm
summary: allow detach cloud-init volumes without restart

[deckhouse-BOaTswain]

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