Run same tests for layout-2020 and layout-2013 (#30092)

Most tests were only being run for layout-2013, not for layout-2020.
This wasn't great since layout-2020 is now the default.

So this patch unifies the lists of included tests for both layouts.
For layout-2013 this implies adding css/css-content/, css/css-logical/
and css/css-masking/clip/.
For layout-2020 this implies adding several additional css tests, and
also tests like dom/, js/, html/, etc.

tests/wpt/meta/html/browsers/browsing-the-web/unloading-documents/001.html.ini

@@ -0,0 +1,3 @@
+[001.html]
+  [document.open in unload]
+    expected: FAIL

tests/wpt/meta/html/browsers/browsing-the-web/unloading-documents/002.html.ini

@@ -0,0 +1,3 @@
+[002.html]
+  [document.open in unload]
+    expected: FAIL

tests/wpt/meta/html/browsers/browsing-the-web/unloading-documents/003.html.ini

@@ -0,0 +1,3 @@
+[003.html]
+  [document.open in beforeunload with link]
+    expected: FAIL

tests/wpt/meta/html/browsers/browsing-the-web/unloading-documents/004.html.ini

@@ -0,0 +1,3 @@
+[004.html]
+  [document.open in beforeunload with button]
+    expected: FAIL

tests/wpt/meta/html/browsers/browsing-the-web/unloading-documents/005.html.ini

@@ -0,0 +1,3 @@
+[005.html]
+  [document.open in pagehide in iframe]
+    expected: FAIL

tests/wpt/meta/html/browsers/browsing-the-web/unloading-documents/beforeunload-on-history-back.html.ini

@@ -0,0 +1,3 @@
+[beforeunload-on-history-back.html]
+  [beforeunload event fires on history navigation back]
+    expected: FAIL

tests/wpt/meta/html/browsers/browsing-the-web/unloading-documents/beforeunload-on-navigation-of-parent.html.ini

@@ -0,0 +1,3 @@
+[beforeunload-on-navigation-of-parent.html]
+  [beforeunload in iframe on navigation of parent]
+    expected: FAIL

tests/wpt/meta/html/browsers/browsing-the-web/unloading-documents/unload/003.html.ini

@@ -0,0 +1,3 @@
+[003.html]
+  [unload event properties]
+    expected: FAIL

tests/wpt/meta/html/browsers/browsing-the-web/unloading-documents/unload/006.html.ini

@@ -0,0 +1,4 @@
+[006.html]
+  expected: TIMEOUT
+  [salvagable state of document after setting pagehide listener]
+    expected: TIMEOUT