SOS-2059 Refactor Notification PortletKeys
SOS-2059 Add notifications-shared project
SOS-2059 Notifications unavailable due to missing variable (so-portlet)
SOS-2059 Not needed, since a jar it needs already needs those
LPS-44620 Marketplace URLs requires portlet namespace
LPS-44620 Use PortalUtil.getPortletNamespace
LPS-44628 Delete calendar booking instance should propagate to children