feat(FilterableMultiSelect): assign given id to the listbox

[cuppajoey]

Currently, the FilterableMultiSelect does not assign its id prop to any rendered element making that prop mostly useless for consumers. While it does use the id to create ids for descendant elements; this is inconsistent with MultiSelect which does assign its id prop to the list box container.

This discrepancy can be observed in the Carbon storybook:

✅ MultiSelect	❌ Filterable

Changelog

New

• Pass the existing id prop to the rendered ListBox for parity with MultiSelect.
• Add test to coverage assignment of id.

Testing / Reviewing

• Checkout and build branch
• Run storybook locally and visit FilterableMultiSelect playground.
• Inspect DOM element with .cds--multi-select class and confirm id attribute is assigned the given value.

[github-actions]

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[guidari]

Thanks for the contribution!