Trac #34771: switch to libgap in sage/coding
after #34737 there are still uses of pexpect GAP left there.
We remove them on this ticket.
Part of #26902
URL: https://trac.sagemath.org/34771
Reported by: dimpase
Ticket author(s): Dima Pasechnik
Reviewer(s): Vincent Delecroix, Matthias Koeppe
Committer
Release Manager
