Add HelpText to CheckboxGroup and RadioGroup (#3527)
* add to checkbox group
* add to radio group
* remove useLabel
* fix structure
* add tests
* add to chromatic
* typo
* add stories for error icon
* udpate AriaCheckboxGroupProps type
* update AriaRadioGroupProps type
* add chromatic stories for CheckboxGroup
* add aria-describedby to invidual checkboxes
* add aria-describedby to individual radios
* add fixed width to validation stories
* linter
* improve types
* improve story description
Co-authored-by: Daniel Lu <dl1644@gmail.com>
