fix(ext/node): deep assert compatibility

[Tango992]

Allows https://github.com/nodejs/node/blob/v24.12.0/test/parallel/test-assert-deep.js to pass. This marks 100% coverage of node compat tests related to the assert module.

[kajukitli]

looks good overall - nice to get 100% assert coverage.

couple small things to note (not blockers):

1. tc_scope rethrow pattern in util.rs - the pattern is sound, but the dummy array allocation after rethrow feels weird. might be worth a brief comment like "v8 will discard this return value" or something. minor readability thing.

2. kKeyObject on CryptoKey - clever solution for making WebCrypto keys comparable with Node's KeyObjects. makes sense.

3. isError refactor - good cleanup, consolidating the isNativeError || ObjectPrototypeIsPrototypeOf(ErrorPrototype, ...) pattern into a single helper.

4. console isURL check - the check does typeof value.href === 'string' before the prototype check which is good for perf (avoids slower prototype lookup on non-URL objects).