[ADF-4970] Improve breadcrumb accessibility (#5187)

* [ADF-4970] improve accessibility for dropdown-breadcrumb

- allow keyboard only control

* [ADF-4970] add accessibility improvements to breadcrumb.component

* [ADF-4970] more fixes & preventDefault for click event

* [ADF-4970] better keyboard-only experience when selecting a breadcrumb option

* [ADF-4970] set focus color on content-node-selector breadcrumb

* [ADF-4970] set aria-current to location

* [ADF-4970] extra check - fix unit test

lib/content-services/src/lib/breadcrumb/breadcrumb.component.ts

@@ -131,6 +131,7 @@ export class BreadcrumbComponent implements OnInit, OnChanges, OnDestroy {
     open(): void {
         if (this.dropdown) {
             this.dropdown.open();
+            this.dropdown.focus();
         }
     }
 
@@ -178,7 +179,7 @@ export class BreadcrumbComponent implements OnInit, OnChanges, OnDestroy {
     }
 
     onRoutePathClick(route: PathElementEntity, event?: Event): void {
-        if (event) {
+        if (event && event.type === 'click') {
             event.preventDefault();
         }