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.

Beginnen Sie mit com.cloud.upgrade.SystemVmTemplateRegistration.registerOrUpdateSystemVmTemplate in SystemVmTemplateRegistration.java:1040 und prüfen Sie die Upgrade-Logs auf das fehlende HyperV-Template unter /usr/share/cloudstack-management/templates/systemvm/. Reproduzieren Sie das Upgrade von 4.20.1 auf 4.22 mit den aufgeführten Hypervisoren und überprüfen Sie anschließend, dass die 4.22-SystemVM-Templates ohne checksum- oder Cannot upgrade system VMs-Fehler registriert werden.

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