XWIKI-8794: Get rid of Portlet API in oldcore
XWIKI-8794: Get rid of Portlet API in oldcore

pbondoer/xwiki-platform,pbondoer/xwiki-platform,xwiki/xwiki-platform,pbondoer/xwiki-platform,xwiki/xwiki-platform,xwiki/xwiki-platform,pbondoer/xwiki-platform,xwiki/xwiki-platform,pbondoer/xwiki-platform,xwiki/xwiki-platform