Auto merge of #23351 - CYBAI:fix-modes, r=nox

Fix modes for fetching classic worker script and introduce parser metadata for request

While reading [the spec](https://html.spec.whatwg.org/multipage/#fetch-a-classic-worker-script) for `fetch a classic worker script`, I found the `mode` and `credential-mode` are opposite to the spec. So, the first commit will fix it.

Also, I found there's a `parser metadata` for `request` so I tried to introduce it in this PR as well.

For WPT, I found there's a `/workers/constructors/Worker/same-origin.html` which was disabled in  #3180. We pass most of the tests now.

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [ ] These changes fix #___ (GitHub issue number if applicable)
- [x] There are tests for these changes

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tests/wpt/metadata/workers/constructors/Worker/same-origin.html.ini

@@ -1,3 +1,9 @@
 [same-origin.html]
   type: testharness
-  disabled: intermittent failures
+  expected: TIMEOUT
+  [unsupported_scheme]
+    expected: FAIL
+
+  [about_blank]
+    expected: TIMEOUT
+