[4.2] Fix radio form field required validation

[joomdonation]

Pull Request for Issue #39496.

Summary of Changes

Base on code at https://github.com/joomla/joomla-cms/blob/4.2-dev/build/media_source/system/js/fields/validate.es6.js#L192 and https://github.com/joomla/joomla-cms/blob/4.2-dev/build/media_source/system/js/fields/validate.es6.js#L194 , to validate a radio form field as required, the fieldset element in radio form field layout must has class attribute contains radio . The element also need to have required attribute or required in it's class.

Since required is not a valid attribute for fieldset element, I set class="required radio" when the field is required to address the issue.

Testing Instructions

1. Open the file administrator/components/com_content/forms/article.xml, add the below code after id field:

<field name="status" id="status" type="radio" class="btn-group"
			label="HISTORY_STATUS" 
			description="HISTORY_STATUS" 
		        required="true"
			default="0"
		>
			<option value="1">In Process</option>
  			<option value="2">Return</option>
			<option value="3">Sent</option>
		</field>

2. Edit the file administrator/components/com_content/tmpl/article/edit.php, add this line of code below after this line https://github.com/joomla/joomla-cms/blob/4.2-dev/administrator/components/com_content/tmpl/article/edit.php#L66 to render the new field

<div class="row"><?php echo $this->form->getInput('status'); ?></div>

3. Create a new article, try to save the article without choosing an option from the new field above

Actual result BEFORE applying this Pull Request

The form is submitted even the radio field is a required field.

Expected result AFTER applying this Pull Request

Form is not submitted, an error message like below will be displayed:

The form cannot be submitted as it's missing required data.
Please correct the marked fields and try again.

Link to documentations

Please select:

• No documentation changes for docs.joomla.org needed
• No documentation changes for manual.joomla.org needed

[samuelagus]

I have tested this item ✅ successfully on 6481d66

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/39578.}

[heelc29]

I have tested this item ✅ successfully on 6481d66

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/39578.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/39578.}

[roland-d]

Thank you