Enable more css tests (#31469)

* Enable more css tests

In particular, these directories are no longer skipped:
 - CSS1 (has no tests)
 - css-box (except margin-trim)
 - css-cascade
 - css-display (except run-in)
 - css-easing
 - css-env
 - css-lists
 - css-namespaces
 - css-overflow
 - css-pseudo
 - css-sizing (except aspect-ratio and contain-intrinsic-size)
 - css-syntax
 - reference
 - support (has no tests)

* Sort list properly

* Explicitly list skipped directories

* Do not skip css tests by default

* Add expectations

tests/wpt/meta/css/css-pseudo/parsing/tree-abiding-pseudo-elements.html.ini

@@ -0,0 +1,39 @@
+[tree-abiding-pseudo-elements.html]
+  ["::marker" should be a valid selector]
+    expected: FAIL
+
+  ["*::marker" should be a valid selector]
+    expected: FAIL
+
+  ["foo.bar[baz\]::marker" should be a valid selector]
+    expected: FAIL
+
+  ["::placeholder" should be a valid selector]
+    expected: FAIL
+
+  ["*::placeholder" should be a valid selector]
+    expected: FAIL
+
+  ["foo.bar[baz\]::placeholder" should be a valid selector]
+    expected: FAIL
+
+  ["::file-selector-button" should be a valid selector]
+    expected: FAIL
+
+  ["::file-selector-button:hover" should be a valid selector]
+    expected: FAIL
+
+  ["::file-selector-button:focus" should be a valid selector]
+    expected: FAIL
+
+  ["::file-selector-button:active" should be a valid selector]
+    expected: FAIL
+
+  ["::file-selector-button:is(:hover)" should be a valid selector]
+    expected: FAIL
+
+  ["::before::marker" should be a valid selector]
+    expected: FAIL
+
+  ["::after::marker" should be a valid selector]
+    expected: FAIL