Include UUID of disk backing in disk backup

This change modifies the disk backups to also include disk backing
UUIDs.  This allows us to look up and identify disks using UUIDs to
differentiate classic disks from disks that should be FCDs.

For now, the disk UUIDs are only used in failover workflows since
vSphere Replication guarantees that the disks will be restored with
the same UUID as the primary/source.

pkg/backup/api/backup_types.go

@@ -36,13 +36,21 @@ type PVCDiskData struct {
 	PVCName string
 	// AccessMode is the access modes of the PVC backed by the virtual disk.
 	AccessModes []string
+
+	// UUID is the UUID of the virtual disk device backing. This
+	// is only used in fail-over workflows.
+	UUID string
 }
 
 // ClassicDiskData contains the backup data of a classic (static) disk attached
 // to VM.
 type ClassicDiskData struct {
 	// Filename is the datastore path to the virtual disk.
 	FileName string
+
+	// UUID is the UUID of the virtual disk device backing. This
+	// is only used in fail-over workflows.
+	UUID string
 }
 
 const (

pkg/providers/vsphere/virtualmachine/backup.go

@@ -423,10 +423,12 @@ func getDesiredDiskDataForBackup(opts BackupVirtualMachineOptions) (string, stri
 						FileName:    b.FileName,
 						PVCName:     pvc.Name,
 						AccessModes: backupapi.ToPersistentVolumeAccessModes(pvc.Spec.AccessModes),
+						UUID:        b.Uuid,
 					})
 				} else if _, ok := opts.ClassicDiskUUIDs[b.Uuid]; ok {
 					classicDiskData = append(classicDiskData, backupapi.ClassicDiskData{
 						FileName: b.FileName,
+						UUID:     b.Uuid,
 					})
 				}
 			}

pkg/providers/vsphere/virtualmachine/backup_test.go

@@ -688,9 +688,10 @@ func backupTests() {
 
 						diskData := []backupapi.PVCDiskData{
 							{
-								FileName:    vcSimDiskFileName,
+								FileName:    vcSimDiskFileName, //
 								PVCName:     dummyPVC.Name,
 								AccessModes: backupapi.ToPersistentVolumeAccessModes(dummyPVC.Spec.AccessModes),
+								UUID:        vcSimDiskUUID,
 							},
 						}
 						diskDataJSON, err := json.Marshal(diskData)
@@ -1010,6 +1011,7 @@ func backupTests() {
 							diskData := []backupapi.ClassicDiskData{
 								{
 									FileName: vcSimDiskFileName,
+									UUID:     vcSimDiskUUID,
 								},
 							}
 							diskDataJSON, err := json.Marshal(diskData)