OZG-5977 clear uploaded files on navigation

alfa-client/libs/wiedervorlage-shared/src/lib/wiedervorlage.service.spec.ts

@@ -442,6 +442,13 @@ describe('WiedervorlageService', () => {
       service.setWiedervorlageListReload = jest.fn();
       (<any>service).forceWiedervorlageReload = jest.fn();
       service.clearWiedervorlagenList = jest.fn();
+      service.clearUploadedFiles = jest.fn();
+    });
+
+    it('should clear uploaded files', () => {
+      service.onNavigation({});
+
+      expect(service.clearUploadedFiles).toHaveBeenCalled();
     });
 
     describe('to vorgang detail', () => {