[fix] Limited aria-describedby Support in Combobox Components

[tyler-maddox-gdit]

ReactUSWDS Version & USWDS Version:

• "react": "^18.2.0"
• "react-dom": "^18.2.0"
• "@trussworks/react-uswds": "^11.0.0"
• "@uswds/uswds": "3.13.0"
• "next": "^14.2.35"

Describe the bug

Currently, the only way to apply an aria-describedby property to Combobox components is by using the predefined --assistiveHint ID. This limitation prevents developers from associating multiple unique IDs for field descriptors to the Combobox input. Consequently, only a single descriptor can be programmatically announced to assistive technology users, which is insufficient for cases that involve multiple field descriptors.

To Reproduce
Steps to reproduce the behavior:

1. Create a Combobox component.
2. Add an aria-describedby attribute using the --assistiveHint ID.
3. Attempt to associate more than one unique ID as field descriptors to the same Combobox input.
4. Observe that only one descriptor is programmatically announced.

Expected behavior

Combobox components should provide a mechanism to pass unique ID values to the aria-describedby attribute on the combobox input. This ensures accessibility compliance (specifically WCAG 1.3.1) for cases where multiple field descriptors are required to fully describe a field to assistive technologies.