When the bulk actions are first rendered, the item count in the
aria-live region will not be announced by screen readers as aria-live
regions need to be present in the DOM and changed before screen readers
can announce their content.
This commit ensures that the item selection count will be announced
when the bulk actions get added to the DOM by calling
`updateBulkItemSelection()` after rendering the bulk actions HTML. This
removes the non-breaking space in the template, effectively causing a
change in DOM without affecting the visuals, and allowing screen readers
to announce the contents of the item count.
Jun Pataleta
280d9de9c3