[ADF-4966] Keep table headers - visually hidden when showHeader false (#5170)

* [ADF-4966] Move or copy - Add table headers - visually hidden

- needed by screen readers

* [ADF-4966] use automatic column header translation

* [ADF-4966] move the fix to the datatable component

-improve accessibility - keep table headers-but visually hidden for showHeader false

* [ADF-4966] code review change

* [ADF-4966] fix array shallow copy on failing e2e-test

* [ADF-4966] improve accessibility only for list display

- fixes failing test

lib/testing/src/lib/core/pages/data-table-component.page.ts

@@ -130,7 +130,7 @@ export class DataTableComponentPage {
                 initialList.push(text.toLowerCase());
             }
         });
-        let sortedList = initialList;
+        let sortedList = [...initialList];
         sortedList = sortedList.sort();
         if (sortOrder.toLocaleLowerCase() === 'desc') {
             sortedList = sortedList.reverse();