fix: pressing arrow keys behavior on Radio buttons

[tnyo43]

What:

Fix a bug in the behavior of the keyboard operations on the radio buttons.

Why:

closes #1048

How:

• updating test cases
  • increase amount of radio buttons in test situations to make the behavior easier to understand
  • fix the assertion of the test cases as it should be
• fix the code to behave correctly

Checklist:

• [N/A] Documentation
• [x] Tests
• [x] Ready to be merged

FYI

I know there is already another PR https://github.com/testing-library/user-event/pull/1049 for this bug. However, it has past several months since it stop its activity.

[codesandbox-ci[bot]]

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Latest deployment of this branch, based on commit 5e9fd2b83a4c1f996237f2d32e90ed083c500468:

Sandbox	Source
userEvent-dom	Configuration
userEvent-react	Configuration
silent-sun-kxlrgr	Issue #1048
zen-feather-hx0h14	Issue #1048

[tnyo43]

@ph-fritsche @Gpx @kentcdodds can we merge this PR? If I can help something to merge, I will gladly cooperate with you.