feat(16248): RadioButtonGroup supports 'required' prop and attaches it to children RadioButton

[2nikhiltom]

Closes #16248

RadioButtonGroup supports 'required' prop and attaches it to children RadioButton

New

• RadioButtonGroup supports 'required' prop and attaches it to children RadioButton
• RadioButton supports 'required' prop and attaches it to underlying Input
• Adds new TestCases to verify this functionality

The required attribute has to be specified only on RadioButtonGroup instead of on every child RadioButton

<RadioButtonGroup required name="group" legendText="Storage tier (disk)">
          <RadioButton labelText="Free (1 GB)" value="free" />
          <RadioButton labelText="Standard (10 GB)" value="standard" />
 </RadioButtonGroup>

Changed

• RadioTile accepts required prop
• PublicAPI snapshot updated with 'required' boolean attribute
• The required attribute has to be specified only on RadioButtonGroup instead of on every child RadioButton

Testing / Reviewing

• (Take pull of this PR and update any one of the storybook example with below code )
• Verify required attribute is attached to all children RadioButton

export const Test = () => {
  function onSubmit(e) {
    e.preventDefault();
    alert('submitted');
  }

  return (
    <div style={{ padding: '2em' }}>
      <Form onSubmit={onSubmit}>
        <RadioButtonGroup name="radio" required>
          <RadioButton value="1"   labelText="test-label">
            Tile 1
          </RadioButton>
          <RadioButton value="2"  labelText="test-label">
            Tile 2
          </RadioButton>
          <RadioButton value="3"  labelText="test-label">
            Tile 3
          </RadioButton>
        </RadioButtonGroup>
        <Button type="submit">Submit</Button>
      </Form>
    </div>
  );
};

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[preetibansalui]

LGTM