after #34737 there are still uses of pexpect GAP left there.
We remove them on this ticket.

Part of #26902

Depends on #34770

CC: @kwankyu @fchapoton @wdjoyner @mkoeppe

Component: coding theory

Author: Dima Pasechnik

Branch/Commit: b1257bf

Reviewer: Vincent Delecroix, Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/34771