fix(res): throw error when res.redirect(undefined) is called

[BOXER78]

Calling res.redirect(undefined) currently sends a 302 response with Location: undefined,
resulting in an invalid redirect header.

This PR throws a TypeError when the URL argument is missing, consistent with the deprecation
warning ("Provide a url argument") and prevents malformed headers.

Improved the redirect tests to match Express behavior more accurately:

• correct expected error message
• unified jsonError handler
• stronger Location header assertion
• stack presence check

The updated test suite does not change redirect behavior, but validates it more accurately and prevents future regressions.
Fixes#6941

[bjohansebas]

#6948 (review)