Force XWikiHibernate* components to use the XWikiContext from the Execution context

XWikiHibernate* classes are quite critical and should protect themself from bad code calling with a XWikiContex which in not in sync with the Execution context (for example XWIKI-13389). Most of the time it ends up in broken cache at best. That's because many components called directly or indirectly by hibernate store methods are manipulating the XWikiContext found in the Execution context.