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cluster-alerts: Add DeprecatedMachineType alert rule (#3358)

This commit introduces the `DeprecatedMachineType` alert rule to detect
when a VM is using a deprecated machine type.

Updated Rule Expression:
kubevirt_vm_info
* on(machine_type) group_left()
  max(kubevirt_node_deprecated_machine_types) by (machine_type)

How It Works:
- Uses only `kubevirt_vm_info`, covering both running and stopped VMs.
- Joins each VM's machine type against the cluster's deprecated types.
- Fires when any VM uses a deprecated type.

Alert Details:
- Fires after 5m of continuous match.
- Summary: VM <namespace>/<name> is using a deprecated machine type.
- Description: Includes VM name, namespace, and machine type.
- Severity: warning, operator_health_impact: warning.

This alert ensures clusters are aware of workloads relying on deprecated
machine types, helping admins migrate them before they become deprecated.

Signed-off-by: Daniel Sionov <dsionov@redhat.com>

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