chore: consistently use new `getDi` utility

lib/draw/BpmnRenderUtil.js

@@ -3,10 +3,16 @@ import {
   some
 } from 'min-dash';
 
+import {
+  getDi
+} from '../util/ModelUtil';
+
 import {
   componentsToPath
 } from 'diagram-js/lib/util/RenderUtil';
 
+// re-export getDi for compatibility
+export { getDi };
 
 // element utils //////////////////////
 
@@ -42,10 +48,6 @@ export function isCollection(element) {
   return element.isCollection || (dataObject && dataObject.isCollection);
 }
 
-export function getDi(element) {
-  return element.di;
-}
-
 export function getSemantic(element) {
   return element.businessObject;
 }

lib/features/di-ordering/BpmnDiOrdering.js

@@ -1,4 +1,4 @@
-import { getDi } from '../../draw/BpmnRenderUtil';
+import { getDi } from '../../util/ModelUtil';
 
 import {
   filter,