fix(core): use updated aria control attribute for root element

[dhayab]

Summary

This PR updates getRootProps() to return aria-controls instead of aria-owns, following the latest ARIA specs.

From MDN:

When a combobox's popup is displayed, ensure the aria-controls attribute on the combobox element is set to the id of the popup listbox, tree, grid, or dialog element. This is how the relationship between the element with the combobox role and the popup it controls is indicated. (Note: In older ARIA specs, this was aria-owns rather than aria-controls, so you may see aria-owns in older combobox implementations. The aria-owns in the code should be updated to aria-controls!)

Result

Assistive technologies correctly link the combobox with the listbox it controls. Accessibility tools like WAVE and axe stop reporting errors relevant to this.

Closes #1271

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[sarahdayan]

LGTM!

A good improvement for the future would be to include automated Axe Core tests in our CI to flag those issues.