test: report actual error code on failure

Add a custom message to parallel/test-dgram-error-message-address so
that the actual error code that doesn't match the allowed errors is
output on assertion failure.

PR-URL: https://github.com/nodejs/node/pull/34134


Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Shelley Vohr <codebytere@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>