[session] Drop long deprecated [get/set]_shared_data methods
they are deprecated since 3.19 and access to the .data attribute itself
deprecated in 3.25, so it's time to drop them.
missing-dep-for-interpreter make => make | build-essential | dpkg-dev (usr/*/cubicweb/skeleton/debian/rules)
embedded-javascript-library usr/share/cubicweb/cubes/shared/data/jquery.js