LPS-43813 - Load portlets JS and CSS files via ComboServlet too
LPS-43812 - Add themeId to protectedParameters in ComboServlet
LPS-43813 SF
LPS-43813 Rename comboPath variables for portlet resources
LPS-43813 themeId param is not required in js combo request.

It is required only in combo requests for portlet css resources to properly parse sass files. See DynamicCSSUtil.
LPS-43813 The timestamp for portlet resources should be that of the theme.

PortalUtil#getStaticResourceURL will add the right timestamp.