[ADF- 4871][TaskHeaderCloudComponent] Add Candidate Users/Groups properties (#5189)

* [ADF-4871] [TaskHeaderCloudComponent] Add Candidate Users/Groups properties

* Added Candidate users/groups properties to the task heade cloud component.

* * Created CardViewArrayItemComponent
* Modified FullName pipe to return username or email incase fullname missing.
* Added candidate Users/Groups properties to the taskcloudheader component.
* Added two service into task-cloudservice
* Updated Demoshell card-view with new widget

* * Fixed failing unit test

* * Fixed comments.

* * Refactored CardViewArrayItem model
* Fixed comments.

* * Changed candidate group icon

demo-shell/src/app/components/card-view/card-view.component.ts

@@ -28,7 +28,8 @@ import {
     CardViewUpdateService,
     CardViewMapItemModel,
     UpdateNotification,
-    DecimalNumberPipe
+    DecimalNumberPipe,
+    CardViewArrayItemModel
 } from '@alfresco/adf-core';
 import { of, Subject } from 'rxjs';
 import { takeUntil } from 'rxjs/operators';
@@ -148,6 +149,14 @@ export class CardViewComponent implements OnInit, OnDestroy {
                 clickCallBack: () => {
                     this.respondToCardClick();
                 }
+            }),
+            new CardViewArrayItemModel({
+                label: 'CardView Array of items',
+                value: of(['Zlatan', 'Lionel Messi', 'Mohamed', 'Ronaldo']),
+                key: 'array',
+                icon: 'directions_bike',
+                default: 'Empty',
+                noOfItemsToDisplay: 2
             })
         ];
     }