chore(*): Fix build errors.

Author: MKirova

projects/igniteui-angular-elements/src/lib/grids/grid.component.ts

@@ -80,9 +80,7 @@ import { IgxGridDetailsPipe } from '../../../../igniteui-angular/src/lib/grids/g
         IgxForOfScrollSyncService,
     ],
     imports: [
-        NgIf,
         NgClass,
-        NgFor,
         NgStyle,
         NgTemplateOutlet,
         IgxGridGroupByAreaComponent,

projects/igniteui-angular-elements/src/lib/grids/hierarchical-grid.component.ts

@@ -71,9 +71,7 @@ import { IgxRowIslandElementsComponent } from './row-island.component';
         IgxRowIslandAPIService
     ],
     imports: [
-        NgIf,
         NgClass,
-        NgFor,
         NgTemplateOutlet,
         NgStyle,
         IgxGridHeaderRowComponent,
@@ -163,9 +161,6 @@ export class IgxHierarchicalGridElementsComponent extends IgxHierarchicalGridCom
     @Output()
     public columnsAutogenerated = new EventEmitter<IColumnsAutoGeneratedEventArgs>();
 
-    @Output()
-    public selectedRowsChange = new EventEmitter<any[]>();
-
     /* contentChildren */
     /* blazorTreatAsCollection */
     /* blazorCollectionName: ActionStripCollection */

projects/igniteui-angular-elements/src/lib/grids/tree-grid.component.ts

@@ -77,8 +77,6 @@ import { IgxActionStripToken } from 'igniteui-angular/src/lib/action-strip/token
         IgxForOfScrollSyncService
     ],
     imports: [
-        NgIf,
-        NgFor,
         NgClass,
         NgStyle,
         NgTemplateOutlet,