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
- [ ] These changes do not require tests because _____

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tests/wpt/metadata/eventsource/eventsource-request-cancellation.htm.ini

@@ -1,5 +0,0 @@
-[eventsource-request-cancellation.htm]
-  type: testharness
-  [EventSource: request cancellation]
-    expected: FAIL
-

tests/wpt/metadata/html/browsers/browsing-the-web/navigating-across-documents/010.html.ini

@@ -1,3 +1,4 @@
 [010.html]
   type: testharness
-  expected: TIMEOUT
+  [Link with onclick form submit to javascript url with delayed document.write and href navigation ]
+    expected: FAIL

tests/wpt/metadata/html/browsers/the-window-object/window-properties.https.html.ini

@@ -1,7 +1,4 @@
 [window-properties.https.html]
-  [Window method: stop]
-    expected: FAIL
-
   [Window method: focus]
     expected: FAIL
 

tests/wpt/metadata/html/semantics/scripting-1/the-script-element/script-onerror-insertion-point-2.html.ini

@@ -1,3 +0,0 @@
-[script-onerror-insertion-point-2.html]
-  type: testharness
-  expected: TIMEOUT

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

tests/wpt/metadata/performance-timeline/webtiming-resolution.any.js.ini

@@ -4,7 +4,7 @@
 [webtiming-resolution.any.worker.html]
   expected: TIMEOUT
   [Verifies the resolution of performance.now() is at least 20 microseconds.]
-    expected: FAIL
+      expected: FAIL
 
   [Verifies the resolution of entry.startTime is at least 20 microseconds.]
     expected: TIMEOUT