feat: add i18n error message support for RadioButtonGroup #6477
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Description
The PR introduces RadioButtonGroupI18n with a method for setting a required error message and updates the RadioButtonGroup's validation logic to show this error message when validation fails. It should be mentioned that RadioButtonGroup is an atypical component in terms of validation. It has a required flag, but no user interaction can trigger the required error message – the message only appears if the value is programmatically reset to null. Therefore, the i18n object is practically unnecessary, but it's still added to maintain consistency with other components.
Part of #4618
Type of change