[ADF-2035] Drag and drop is not working on Processes - attachment List (#2736)

* fix upload for process attachment list
export ActivitiContentService
ProcessService.createOrUpdateProcessInstanceVariables has incorrect method signature

* fix signature methods

* fix test parameters

lib/process-services/process-list/services/process.service.spec.ts

@@ -35,7 +35,6 @@ describe('ProcessService', () => {
 
     beforeEach(() => {
         TestBed.configureTestingModule({
-
             providers: [
                 ProcessService
             ]