test: fix URL v8 fast api tests

[anonrig]

Fixes v8 fast api tests in test-whatwg-url-canparse.js

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.27%. Comparing base (9cc0195) to head (ef8da6e).
Report is 7 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #58021 +/- ##
==========================================
- Coverage 90.28% 90.27% -0.01% 
==========================================
Files 630 630 Lines 186158 186158 Branches 36484 36475 -9 ==========================================
- Hits 168067 168051 -16 - Misses 10974 10988 +14 - Partials 7117 7119 +2 

see 27 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/66463/

[H4ad]

I think is worthy to update the fast api docs to add this note, and maybe the exception when it's called with C++, just to be easy to find the docs when someone receive this error

[anonrig]

Closing in favor of #58023