[7.0] Moves deprecated helpers to compat

[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 deprecated HTML helper functions to the compat plugin. When the whole helper is not deprecated, then the respective functions will throw an exception when the plugin is disabled.

Testing Instructions

• Add the code \Joomla\CMS\HTML\HTMLHelper::_('behavior.core'); to the file /components/com_content/tmpl/featured/default.php
• Open the front end with the compat7 plugin enabled and disabled

Actual result BEFORE applying this Pull Request

It always loads.

Expected result AFTER applying this Pull Request

It loads with the compat plugin enabled and throws the following error when disabled:
behavior::core not found

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:

• No documentation changes for manual.joomla.org needed