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-syntax/declarations-trim-whitespace.html.ini

@@ -0,0 +1,15 @@
+[declarations-trim-whitespace.html]
+  [--foo-3:bar ;]
+    expected: FAIL
+
+  [--foo-4: bar ;]
+    expected: FAIL
+
+  [--foo-5: bar !important;]
+    expected: FAIL
+
+  [--foo-6: bar !important ;]
+    expected: FAIL
+
+  [--foo-9:bar (then ws until end of rule)]
+    expected: FAIL