CSI: plugin config updates should always be destructive (#12774)

.changelog/12774.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+csi: Fixed a bug where plugin configuration updates were not considered destructive
+```

scheduler/util.go

@@ -551,6 +551,9 @@ func tasksUpdated(jobA, jobB *structs.Job, taskGroup string) bool {
 		if !reflect.DeepEqual(at.Templates, bt.Templates) {
 			return true
 		}
+		if !reflect.DeepEqual(at.CSIPluginConfig, bt.CSIPluginConfig) {
+			return true
+		}
 
 		// Check the metadata
 		if !reflect.DeepEqual(