Auto merge of #21111 - gterzian:implement_document_load_cancellation, r=jdm

Implement document load cancellation

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- [ ] `./mach build -d` does not report any errors
- [ ] `./mach test-tidy` does not report any errors
- [ ] These changes fix #19309 fix #21114 fix #21113 (github issue number if applicable).

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- [ ] There are tests for these changes OR
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tests/wpt/metadata/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/aborted-parser.window.js.ini

@@ -1,8 +1,3 @@
 [aborted-parser.window.html]
-  expected: TIMEOUT
   [document.open() after parser is aborted]
-    expected: TIMEOUT
-
-  [async document.open() after parser is aborted]
-    expected: TIMEOUT
-
+    expected: FAIL