Set use-URL-credentials flag when establishing a connection

[domenic]

This ensures credentials from the URL are used in response to a 401, which is what browsers do. See nodejs/undici#4744 (comment) for more detail.

• At least two implementers are interested (and none opposed):
  • Everyone already implements this
• Tests are written and can be reviewed and commented upon at:
  • https://wpt.fyi/results/websockets?label=master&label=experimental&aligned&q=websockets%2Fbasic-auth
• Implementation bugs are filed:
  • Chromium: N/A
  • Gecko: N/A
  • WebKit: N/A
  • Deno: …
  • Node.js: WebSocket (and probably fetch) does not support Authorization header from URL nodejs/undici#4744
• 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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