VMs configured with VMHA should be migrated to another storage and kept running when the primary storage is put on maintenance.

### The required feature described as a wish

When a primary storage is put on maintenance, the systemVMs are migrated to another primary storage and all user VMs are stopped. The user VMs are migrated on demand when they are manually started.

This might not be the intended behaviour for Instances on which VMHA is enabled and which are expected to by highly available. We might add a global config which will control if the Instances configured with VMHA are automatically migrated and are kept running.

Creating this issue to discuss and track this feature request.

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Discussed on https://github.com/apache/cloudstack/issues/12215
From the documentation https://docs.cloudstack.apache.org/en/4.22.0.0/adminguide/storage.html#maintenance-mode-for-primary-storage
`it will stop all guests that have any volume on that storage device.`

Beginnen Sie mit der verknüpften Dokumentation zur Wartung des primären Speichers und Issue #12215; der Inhalt nennt keine Implementierungsdateien oder Tests. Klären Sie die globale Konfiguration und das erwartete Verhalten für VMHA-Instanzen, einschließlich der Migration und des Weiterbetriebs der VMs, und definieren Sie anschließend Tests oder Dokumentation, die das vereinbarte Ergebnis demonstrieren.

Vom Indexierungsmodell aus dem Issue-Text verfasst.