Fix failure loading a workspace created while GAP's stdin was a file into a GAP with stdin attached to a terminal #5573
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... by reverting a previous change that made us disable readline when stdin is not connected to a terminal (see #4495). While that still seems useful, and avoids certain issues when piping GAP output into files, it needs a better implication that avoids the issues described in #5014
Also add a separate CI test suite target "testworkspace" for testing for this issue, and potentially other workspace related issues.
Resolves #5405
Resolves #5014
CC @zickgraf