fix(ui5-flexible-column-layout): add aria-valuenow attribute to separators #11540
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Problem:
Axe DevTools reports critical accessibility errors because focusable separator elements (role="separator" with tabindex="0") are missing the required aria-valuenow attribute.
Solution:
Added aria-valuenow attributes to start and end separators in the template, with new getter methods that derive position values from column widths (as percentages) to provide screen readers with position information.
Fixes: #11533