[ADF-4409] ADF for Activiti Community - Be able to claim/release/complete task (#4677)

* Be able to claim/release/complete task for community
Be able to start a task/process
Fix unsubscribe on destroy

* Fix the construnctor

demo-shell/src/app/components/cloud/community/community-process-details-cloud.component.html

@@ -10,6 +10,7 @@
     <adf-cloud-task-list
         fxFlex
         class="adf-cloud-layout-overflow"
+        [appName]="''"
         [processInstanceId]="processInstanceId"
         (rowClick)="onRowClick($event)"
         #taskCloud>

demo-shell/src/app/components/cloud/community/community-start-task-cloud.component.html

@@ -1,4 +1,5 @@
 <adf-cloud-start-task
+    [appName]="''"
     (error)="openSnackMessage($event)"
     (success)="onStartTaskSuccess()"
     (cancel)="onCancelStartTask()">