test: add test unknown credential error of process.setgroups

Added test to check ERR_UNKNOWN_CREDENTIAL of process.setgroups to
increase coverage.

PR-URL: https://github.com/nodejs/node/pull/22368


Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>