[debian] Remove test/doc Build-Depends We are not actually running tests during package build. (This was disabled for python2, now it is also for python3.) And having these build-depends makes it hard to rebuild the package.

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