[ADF-4973] CLONE - Header - sidenav menu button expanded/collapsed state not exposed via ARIA (#5179)

* Set aria expanded for the sidenav toggle bar

* Define initialSidenavExpanded which can be set in the demo shell than as taken the same true or false value as the sideNav.expandedSidenav value.

* Added some unit tests for the sidenav toggle aria-expanded behaviour

* Update lib/core/layout/components/header/header.component.ts

Co-Authored-By: Denys Vuika <denys.vuika@alfresco.com>

* Update lib/core/layout/components/header/header.component.html

Co-Authored-By: Denys Vuika <denys.vuika@alfresco.com>

* Update demo-shell/src/app/components/app-layout/app-layout.component.html

Co-Authored-By: Denys Vuika <denys.vuika@alfresco.com>

* Update lib/core/layout/components/header/header.component.html

Co-Authored-By: Denys Vuika <denys.vuika@alfresco.com>

* As suggested from Denys remove initialSidnavExpanded property as we already have expandedSidenav

* As suggested from Denys remove initialSidnavExpanded property as we already have expandedSidenav

* As suggested from Denys remove initialSidnavExpanded property as we already have expandedSidenav

demo-shell/src/app/components/app-layout/app-layout.component.html

@@ -5,8 +5,8 @@
         <ng-template let-toggleMenu="toggleMenu">
 
             <adf-layout-header id="adf-header" [title]="title | translate" [redirectUrl]="redirectUrl" [logo]="logo"
-                [tooltip]="tooltip | translate" [showSidenavToggle]="showMenu" [color]="color" [position]="position"
-                (clicked)=toggleMenu($event)>
+                [tooltip]="tooltip | translate" [showSidenavToggle]="showMenu" [expandedSidenav]="expandedSidenav"
+                [color]="color" [position]="position" (clicked)=toggleMenu($event)>
 
                 <div class="app-layout-menu-spacer"></div>