Inspect current impl. in Brave vs Chrome of Local Network Access

[lidel]

Test behavior in Brave, maybe we can remove special-casing now:

• Ref.
  • [LNA] Refactor Brave's Localhost Permission feature to match Chromium's implementation of Local Network Access brave/brave-browser#51843
  • Private Network Access / Local Network Access / CORS-RFC1918 in-web-browsers#184 (comment)