[7.0] Move radio basic field to compat plugin

[laoneo]

• I read the Generative AI policy and my contribution is either not created with the help of AI or is compatible with the policy and GNU/GPL 2 or later.

Summary of Changes

Moves the radiobasic form field to the compatibility plugin.

Testing Instructions

• In the file /administrator/components/com_content/forms/article.xml change line 245 to type="radiobasic" and remove line 247
• Open the article form

Actual result BEFORE applying this Pull Request

The featured toggle is shown as default switcher.

Expected result AFTER applying this Pull Request

The featured toggle is shown as radio group.

Link to documentations

Please select:

• Documentation link for guide.joomla.org:

• No documentation changes for guide.joomla.org needed

• Pull Request link for manual.joomla.org: Move radio basic field to compat plugin Manual#662

• No documentation changes for manual.joomla.org needed

[joomdonation]

I'm using Windows and got this error with the PR:

Warning: include(D:\www\joomla7\libraries\vendor\composer/../../../libraries/src/Form/Field/RadiobasicField.php): Failed to open stream: No such file or directory in D:\www\joomla7\libraries\vendor\composer\ClassLoader.php on line 576

Strange that when I move the class back to libraries/src/Form/Field, it works OK. Anyone uses Windows can confirm?

[laoneo]

Make a `composer install. Looks like composer has that class still in the classmap.

[joomdonation]

I tried to make a fresh installation base on the download package generated by this PR and it works OK. So maybe something wrong with my installation.

[joomdonation]

I have tested this item ✅ successfully on 7f18822

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