VPA Unnecessary error fix and add updateMode value validation

[RottenRat]

Fix unnecessary error test
Case:

updateMode: "Auto"

Before:

🐒 [vpa (#templates)]
     Message:     Getting vpa containers name list for the object failed: {Deployment virt-operator d8-virtualization}
     Module:      virtualization
     Object:      kind = Deployment ; name = virt-operator ; namespace = d8-virtualization

🐒 [vpa (#templates)]
     Message:      VPA updateMode cannot be 'Auto'
     Module:       virtualization
     Object:       kind = VerticalPodAutoscaler ; name = cdi-deployment ; namespace = d8-virtualization
     FilePath:     templates/cdi/cdi-deployment/vpa.yaml

After:

🐒 [vpa (#templates)]
     Message:     Getting vpa containers name list for the object failed: {Deployment virt-operator d8-virtualization}
     Module:      virtualization
     Object:      kind = Deployment ; name = virt-operator ; namespace = d8-virtualization

The extra error has been removed as it should be.

Add updateMode value check tests:
Case:

updateMode: "imagination"

Before:
OK
After:

🐒 [vpa (#templates)]
     Message:      Invalid updateMode 'imagination'. Allowed values are: Off, Initial, Recreate, InPlaceOrRecreate
     Module:       virtualization
     Object:       kind = VerticalPodAutoscaler ; name = virt-controller ; namespace = d8-virtualization
     FilePath:     templates/kubevirt/virt-controller/vpa.yaml

The UpdateMode values are now checked for validity.