Cleanup migrated components (#14625)

Cleans up migrated components by removing unnecessary old behaviour.

- Removes ng-template and ViewChild used by the old Modal Service.
- Remove aria-dismiss used by old Modals.
- Remove aria-haspopup and aria-expanded on bitMenuTriggerFor since it's handled by the directive.

libs/components/src/breadcrumbs/breadcrumbs.component.html

@@ -36,7 +36,6 @@
     bitIconButton="bwi-ellipsis-h"
     [bitMenuTriggerFor]="overflowMenu"
     size="small"
-    aria-haspopup
   ></button>
   <bit-menu #overflowMenu>
     @for (breadcrumb of overflow; track breadcrumb) {