SAK-44066 Remove courier from portal presence (#8431)
This removes the functional use of /courier/ URLs from the portal presence tool,
eliminating end-user requests to /courier/... which serve no purpose, because
requesting the presence list itself also serves to establish the user's presence in a site,
and the morpheus js refreshes the presence anyway.
Complete cleanup left for
SAK-39977, including removal of scheduleUpdate() from headscripts.js
which is referenced from some other places too (JSF widgets).
Should be mergeable back to 20.x