[TB] Minimum Target - Atoms - WCAG 4.1.2: Ensures every ARIA input field has an accessible name (div[aria-controls=":r5:"])

## Problem/Concern
Running Accessibility Insights for Web on the Minimum Target Page produces the following error twice:
### Issue
`Ensures every ARIA input field has an accessible name` ([aria-input-field-name](https://accessibilityinsights.io/info-examples/web/aria-input-field-name))
### Target application
[A11y ThemeBuilder](http://localhost:3000/designSystem/My%20Design)
### Element path
div[aria-controls=":r5:"]
### Snippet
`

Start at the Minimum Target Page in the A11y ThemeBuilder and inspect the MUI Select components matching div[aria-controls=":r5:"], especially the minHeightLabel reference. Verify the accessible names with Accessibility Insights for Web; done means both reported controls pass the aria-input-field-name check.

Written by the indexing model from the issue text.