added radiogroup role to KRadioButtonGroup

[iamshobhraj]

Issue addressed

Addresses #828

Changelog

• Description: Added radiogroup role to the KRadioButtonGroup component as described in https://www.w3.org/WAI/ARIA/apg/patterns/radio/
• Products impact: none
• Addresses: addresses Add radiogroup role to the KRadioButtonGroup #828
• Components: KRadioButtonGroup component.
• Breaking: No
• Impacts a11y: yes
• Guidance: radiogroup role offers a better UX to screen reader users by providing context that they are navigating through (and selecting from) a group of related set of options, and how many they have available.

Testing checklist

• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical and brittle code paths are covered by unit tests
• The change is described in the changelog section above

Reviewer guidance

• Is the code clean and well-commented?
• Are there tests for this change?
• Are all UI components LTR and RTL compliant (if applicable)?
• Add other things to check for here

Comments

[MisRob]

Thank you @iamshobhraj! I will invite my colleagues for review.

[LianaHarris360]

Thank you @iamshobhraj for adding the proper radiogroup role to KRadioButtonGroup, the keyboard navigation still works as intended so this PR is ready to be merged!