Further internal resource loader cleanup

After #4033, we should consider the following cleanup items:

• Blocked on Undici
  • Remove usage of WrapHandler: https://github.com/nodejs/undici/pull/4786, https://github.com/nodejs/undici/pull/4785, and https://github.com/nodejs/undici/pull/4787 will likely help.
  • Move to request() instead of dispatch() in xhr-utils.js: blocked on https://github.com/nodejs/undici/issues/4797, although https://github.com/nodejs/undici/pull/4786 might be the better fix.
  • Remove workaround for bad WebSocket state transitions and events: https://github.com/nodejs/undici/issues/4742, https://github.com/nodejs/undici/issues/4741
  • Keep an eye on a fix for multiple WebSocket connections to the same host: https://github.com/nodejs/undici/issues/4743
  • Wait for DecompressInterceptor to be made public to get rid of our own copy of decompress-interceptor.js in the source tree.
• Rewrite and greatly simplify per-document-resource-loader.js, request-manager.js, and probably resource-queue.js/async-resource-queue.js. Use AbortControllers to shut down all requests on jsdom teardown. Make elements fire their own events. Etc.: https://github.com/jsdom/jsdom/pull/4324