SystemVM template registration failure in upgrading to 4.22

### problem

When upgrading an environment on 4.20.1 with KVM,VMware and Xenserver hypervisors the upgrade process reported an error in upgrading HyperV SystemVM template.

Workaround : Download the template from https://download.cloudstack.org/systemvm/4.22/systemvmtemplate-4.22.0-x86_64-hyperv.vhd.zip to /usr/share/cloudstack-management/templates/systemvm/ on the management server before upgrade. Or use the old method to register the systemVM templates after restarting the service.

```
2025-11-14 05:55:59,844 DEBUG [c.c.u.SystemVmTemplateRegistration] (main:[]) (logid:) /usr/share/cloudstack-management/templates/systemvm/systemvmtemplate-4.22.0-x86_64-hyperv.vhd.zip is not present
2025-11-14 05:55:59,844 ERROR [o.a.c.u.s.DigestHelper] (main:[]) (logid:) Failed to calculate sha512 checksum of template
2025-11-14 05:55:59,847 ERROR [c.c.u.SystemVmTemplateRegistration] (main:[]) (logid:) Exception while registering/updating system VM templates for hypervisors in metadata com.cloud.utils.exception.CloudRuntimeException: Failed to register 4.22.0 templates for hypervisors: [vmware,xenserver,kvm-x86_64,hyperv]. Cannot upgrade system VMs
at com.cloud.upgrade.SystemVmTemplateRegistration.registerOrUpdateSystemVmTemplate(SystemVmTemplateRegistration.java:1040)
```

### versions

4.20.1

### The steps to reproduce the bug

Upgrade 4.20.1 to .422 with KVM,VMware and Xenserver

### What to do about it?

Something is wrong in the upgrade process, needs to be fixed. The issue was not seen when upgraded to RC versions of 4.22, only with KVM.

Comience con com.cloud.upgrade.SystemVmTemplateRegistration.registerOrUpdateSystemVmTemplate en SystemVmTemplateRegistration.java:1040 y revise los registros de actualización en busca de la plantilla HyperV que falta en /usr/share/cloudstack-management/templates/systemvm/. Reproduzca la actualización de 4.20.1 a 4.22 con los hipervisores indicados y, a continuación, verifique que las plantillas SystemVM de 4.22 se registren sin errores de checksum ni Cannot upgrade system VMs.

Escrito por el modelo de indexación a partir del texto del issue.