Remove PHP Portlet support

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 CE RC1
• Fix Version/s: 7.0.0 CE RC1
• Component/s: Legacy, Legacy > PHP Portlet
• Labels: None
• Story Points: 1
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-plugins/pull/5211

We've decided to remove the PHP Portlet support, so the new runtime won't support deploying portlets written in PHP