Fix accessibility regressions (#7336)

* Fix room list roving treeview

New TooltipTarget & TextWithTooltip were not roving-accessible

* Fix programmatic focus management in roving tab index not triggering onFocus handler

* Fix toolbar no longer handling left & right arrows

* Fix roving tab index focus tracking on interactive element like context menu trigger

* Fix thread list context menu roving

* add comment

* fix comment

* Fix handling vertical arrows in the wrong direction

* iterate PR

* delint

* tidy up

src/accessibility/Toolbar.tsx

@@ -52,7 +52,7 @@ const Toolbar: React.FC<IProps> = ({ children, ...props }) => {
         }
     };
 
-    return <RovingTabIndexProvider handleHomeEnd={true} onKeyDown={onKeyDown}>
+    return <RovingTabIndexProvider handleHomeEnd handleLeftRight onKeyDown={onKeyDown}>
         { ({ onKeyDownHandler }) => <div {...props} onKeyDown={onKeyDownHandler} role="toolbar">
             { children }
         </div> }