Skip localhost when evaluating HSTS upgrades

[ericlaw1979]

Fixes #1780

• At least two implementers are interested (and none opposed):
  • Firefox (already shipped)
  • Chrome
• Tests are written and can be reviewed and commented upon at:
  • HSTS is not presently tested via WPT
• Implementation bugs are filed:
  • Chromium: https://issues.chromium.org/issues/41251622
  • Gecko: n/a
  • WebKit: https://bugs.webkit.org/show_bug.cgi?id=282054
  • Deno (not for CORS changes): Skip localhost when evaluating HSTS upgrades denoland/deno#26736
• MDN issue is filed: N/A
• The top of this comment includes a clear commit message to use.

(See WHATWG Working Mode: Changes for more details.)

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[annevk]

Thanks for the patch!

If you rebase against main the build error should go away. I just fixed that.