Sync WPT with upstream (20-08-2023) (#30143)

* Update web-platform-tests to revision b'50e91f3cfd1140cafc188516488f2dca289239af'

* Delete flaky result for css2/linebox/vertical-align-baseline-002

* Delete flaky result for html/rendering/bindings/the-textarea-element-0/cols-default.html.ini

* Delete flaky result for CSS2/lists/list-style-applies-to-001.xht.ini

---------

Co-authored-by: Mukilan Thiyagarajan <mukilan@igalia.com>

tests/wpt/meta/fetch/api/redirect/redirect-keepalive.any.js.ini

@@ -1,4 +1,5 @@
 [redirect-keepalive.any.html]
+  expected: TIMEOUT
   [[keepalive\][new window\][unload\] same-origin redirect]
     expected: FAIL
 

tests/wpt/meta/fetch/fetch-later/sendondiscard.tentative.https.window.js.ini

@@ -0,0 +1,2 @@
+[sendondiscard.tentative.https.window.html]
+  expected: ERROR

tests/wpt/meta/fetch/h1-parsing/resources-with-0x00-in-header.window.js.ini

@@ -1,3 +0,0 @@
-[resources-with-0x00-in-header.window.html]
-  [Expect network error for frame navigation to resource with 0x00 in a header]
-    expected: FAIL

tests/wpt/meta/fetch/metadata/generated/css-images.sub.tentative.html.ini

@@ -185,6 +185,3 @@
 
   [border-image sec-fetch-site - HTTPS downgrade (header not sent)]
     expected: FAIL
-
-  [background-image sec-fetch-site - HTTPS downgrade (header not sent)]
-    expected: TIMEOUT

tests/wpt/meta/fetch/metadata/generated/element-img-environment-change.sub.html.ini

@@ -41,3 +41,6 @@
 
   [sec-fetch-site - HTTPS downgrade-upgrade, no attributes]
     expected: NOTRUN
+
+  [sec-fetch-site - Not sent to non-trustworthy same-origin destination, no attributes]
+    expected: FAIL

tests/wpt/meta/fetch/private-network-access/worker-blob-fetch.tentative.window.js.ini

@@ -34,3 +34,6 @@
 
   [public https to local https: failure.]
     expected: FAIL
+
+  [treat-as-public to public: success.]
+    expected: FAIL