fix(DataTable): expand all header uses correct aria label

[jnm2377]

Closes #10254

Changelog

• applies "collapse all" text when isExpanded is true

Testing / Reviewing

• view Expand All story > inspect the Expand All header button in the dom > when it's collapsed, the aria label should now say "expand all", and vice versa. Compare to wrong label in current storybook.

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[abbeyhrt]

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