LPS-35924 isControlPanelPortlet should also consider that the category might be the SITES_ADMINISTRATION prefix
LPS-35924 Encapsulate the retrieval of the categories map and the storage in the request within PortalImpl

And added benefit is that the portlet can now be invoked from anywhere and not only from within control_panel.jsp

I considered breaking down ACCESS_IN_CONTROL_PANEL into three different actions, but ended up discarding it because for the backend it's still all the Control Panel, its just in the UI that the user does not realize it and thinks that he is in Site Administration or My Account, so I concluded that a solution that only affects the UI would be best.
LPS-35924 SF