Acknowledge too, make acknowledge tasks an action

src-ui/src/app/services/tasks.service.spec.ts

@@ -48,7 +48,7 @@ describe('TasksService', () => {
   it('calls acknowledge_tasks api endpoint on dismiss and reloads', () => {
     tasksService.dismissTasks(new Set([1, 2, 3]))
     const req = httpTestingController.expectOne(
-      `${environment.apiBaseUrl}acknowledge_tasks/`
+      `${environment.apiBaseUrl}tasks/acknowledge/`
     )
     expect(req.request.method).toEqual('POST')
     expect(req.request.body).toEqual({

src-ui/src/app/services/tasks.service.ts

@@ -64,7 +64,7 @@ export class TasksService {
 
   public dismissTasks(task_ids: Set<number>) {
     this.http
-      .post(`${this.baseUrl}acknowledge_tasks/`, {
+      .post(`${this.baseUrl}tasks/acknowledge/`, {
         tasks: [...task_ids],
       })
       .pipe(first())