test: make repl tests more resilient

This refactors two tests to ignore line numbers in stack traces. That
way changed line numbers do not have any impact on the test outcome
anymore.

PR-URL: https://github.com/nodejs/node/pull/28608
Fixes: https://github.com/nodejs/node/issues/28546


Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Lance Ball <lball@redhat.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>