[whatwg/url] Report all hostname state failures for URLPattern (PR #863)

URLPattern's canonicalize a hostname is the only invocation of the basic URL parser with a URL and state override set to hostname state that looks at the return failure.

And since the URL that URLPattern uses is a dummy URL that is ideally not exposed, knowing about all the failure conditions is kind of important.

(Now technically the second return failure added here cannot be observed as the dummy URL won't have credentials or a non-null port, but it seemed good to change that at the same time for consistency.)

This is covered by existing URLPattern web-platform-tests. Some more background can be found in https://github.com/whatwg/urlpattern/issues/252.

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- [ ] At least two implementers are interested (and none opposed):
   * WebKit
   * 
- [x] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * URLPattern tests.
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<a href="https://whatpr.org/url/863.html" title="Last updated on Mar 13, 2025, 11:07 AM UTC (ffaef5a)">Preview</a> | <a href="https://whatpr.org/url/863/076afff...ffaef5a.html" title="Last updated on Mar 13, 2025, 11:07 AM UTC (ffaef5a)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/863

-- Commit Summary --

  * Report all hostname state failures for URLPattern

-- File Changes --

    M url.bs (8)

-- Patch Links --

https://github.com/whatwg/url/pull/863.patch
https://github.com/whatwg/url/pull/863.diff

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