[test] Replace symlinks in legacy_cubes by real copies This solves a "python setup.py build" issue on my machine. Copying these files should not be a big deal because they have been dropped in the "default" branch and we would not touch them in 3.26 branch.

mock
psycopg2-binary
ldap3 < 2
cubicweb-basket
cubicweb-card
cubicweb-comment
cubicweb-file >= 2.2.2
cubicweb-localperms
cubicweb-tag