Refs: #45099

Summary

Enables fetch/api/idlharness.https.any.js from the WPT suite in Node's test runner. This test formally documents the property descriptor regression reported in #45099 — Headers, Request, and Response are currently exposed on globalThis as getter/setter accessor pairs rather than plain { value, writable, enumerable: false, configurable: true } data properties as required by WebIDL.

Enabling the test with known failures as fail.expected creates a CI gate so the regression can't silently worsen and the fix (targeted in a follow-up PR, if you guys think this work makes sense) will be verified automatically.

Changes

WPT fixture sync (git node wpt fetch/api + git node wpt interfaces)

• Adds test/fixtures/wpt/fetch/api/ — the full upstream fetch/api test tree
• Adds test/fixtures/wpt/interfaces/fetch.idl and referrer-policy.idl — required by the
  idlharness test's idl_test(['fetch'], ['referrer-policy', 'html', 'dom'], ...) call
• Updates other interfaces/*.idl files and versions.json to match the synced commit

New test driver (test/wpt/test-fetch.js)

• Runs fetch/api with pretendGlobalThisAs('Window') since the idlharness test branches on
  self.GLOBAL.isWindow()

New status file (test/wpt/status/fetch/api.json)

• 110 server-dependent test files marked skip: "Requires a WPT HTTP server" — these tests need
  a running wptserve/Python backend and are already covered in nodejs/undici's WPT CI
  (see comment in test/common/wpt/worker.js)
• idlharness.https.any.js gets 15 fail.expected entries:
  • 3 for the Headers, Request, Response property descriptor bug (FormData, Response, Request, and Headers have incorrect property descriptors #45099)
  • 5 for FetchLaterResult (unimplemented API)
  • 2 for Window: fetchLater instance checks (unimplemented API)
  • 2 for Window: fetch instance checks (lazy accessor means fetch is an own property of
    globalThis, not prototype-inherited as idlharness expects)
  • 1 for Window: operation fetchLater (unimplemented API)

WPT runner infrastructure fixes (test/common/wpt/worker.js, test/common/wpt.js)

worker.js defined globalThis.GLOBAL without isWorker():

globalThis.GLOBAL = {
   isWindow() { return false; },
+  isWorker() { return false; },
   isShadowRealm() { return false; },
};

Any test calling self.GLOBAL.isWorker() would throw TypeError: self.GLOBAL.isWorker is not a function. The test/wpt/test-hr-time.js driver was already working around this by patching it in an init script; that workaround remains but is now redundant.

pretendGlobalThisAs('Window') in wpt.js was setting globalThis.Window but leaving GLOBAL.isWindow() returning false, so tests pretending to be a Window context still reported themselves as non-Window. Fixed by pushing globalThis.GLOBAL.isWindow = () => true alongside the existing globalThis.Window assignment.

Test result

Ran 27/138 tests, 111 skipped, 26 passed, 1 expected failures, 0 unexpected failures, 0 unexpected passes