RemoteAsset shouldn't throw for hash URLs

[charlespwd]

Describe the bug

That's a perfectly valid URL.

Source

    <link
      rel="expect"
      href="#MainContent"
      blocking="render"
      id="view-transition-render-blocker"
    >

Expected behaviour
No error. URLs that start with # are links to anchors on the page. This is not a remote URL as it is a link to the same page.

Actual behaviour
Error