UI: No migration option in Action when select multiple VMs cross namespaces for storage class migration

 OCP-4.19.0-rc.3
 CNV-v4.19.0.rhel9-170
 MTC 1.8.7-10

Always

1. Create two namespace, mig1 and mig2
2. Create vm1 in mig1 and vm2 in mig2
3. Web console: navigate to Virtualization → VirtualMachines
4. Select multiple VMs cross namespace
5. Click Action 

UI: No migration option in Action when select multiple VMs cross namespaces  for storage class migration, see the screenshot 1

If we only select one VM or select multiple vm in same namespace, the migration option can be shown - see screenshot 2

Should support selecting multiple VMs for storage class migration

In cmdline, we can define multiple VMs cross namespaces for storage class migration

spec:
  destMigClusterRef:
    name: host
    namespace: openshift-migration
  liveMigrate: true
  namespaces:
  - mig1
  - mig2
  - mig3