Bug: multi SelectField is not behaving correctly when read-only

[veej]

Description of the bug

The read-only status for multi SelectField should be improved. In particular:

• If multiSelectMode='summary', it's currently impossible to see the selected options;
• if multiSelectMode='chips', we're currently showing the X buttons to remove a single options, so it's actually possible to change the value

Playroom reproduction

https://playroom.bento.buildo.io/#?code=N4Igxg9gJgpiBcIA8BlGAbGYAuAxAlhlADoB2ABOfgM4CyArutvmZQLaPNqY63QwBeYuAAW%2BAA7VhrchHHMIpagOABtGZWDkAbgEN09GPHIBGADTl0ugEYZjJ8gF8zG8lr0Gj5AEwWrt9GNvJxcKcgBdRxkPQxVVcx9ImUUAYRFdUgBzQWAAChiYAEpyAQA%2BN0oAekryMHR8MABrfCzZCmwRGHIADXJremxsRTbyXVqxcXJsACd8TOzp6inOtrSM7PIYbRgKfAAzZa69wnQoKiXpmF0oAHlSdABPV0glCEwAOnQITPz9Q0KANwyRxRMI0ABKV1u9yepEqpTIZFQGCweBOJDBdE4LDCcgUSjirncfy8CX8dlMISJOhJQT8NgpwWcMiSYQKcQS3lZlFS6SyOVyxTKbhBMghULujzI8MRpBAjiAA

Version

0.20.1

What browsers are you seeing the problem on?

No response