chore(*): Fixing tests.

Author: MKirova

projects/igniteui-angular/src/lib/grids/cell.component.ts

@@ -888,7 +888,7 @@ export class IgxGridCellComponent implements OnInit, OnChanges, OnDestroy {
      * @internal
      */
     @HostListener('keydown', ['$event'])
-    _dispatchEvent(event: KeyboardEvent) {
+    dispatchEvent(event: KeyboardEvent) {
         const key = event.key.toLowerCase();
         const shift = event.shiftKey;
         const ctrl = event.ctrlKey;

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

@@ -91,7 +91,7 @@ export class IgxHierarchicalGridCellComponent extends IgxGridCellComponent imple
      * @internal
      */
     @HostListener('keydown', ['$event'])
-    dispatchEvent(event: KeyboardEvent) {
+    _dispatchEvent(event: KeyboardEvent) {
         const key = event.key.toLowerCase();
         if (event.altKey && !this.row.added) {
             const grid = this.gridAPI.grid;