test: augment tests for SourceTextModule

Adds tests for a few error conditions. Also, adds tests to make sure
the dynamically generated url is correct.

PR-URL: https://github.com/nodejs/node/pull/23573


Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/23572


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>