wpt: Unskip the `css-tables suite (#31131)

This will be useful for tracking improvements to table support.

tests/wpt/meta/css/css-tables/tentative/baseline-table.html.ini

@@ -0,0 +1,45 @@
+[baseline-table.html]
+  [.container 1]
+    expected: FAIL
+
+  [.container 2]
+    expected: FAIL
+
+  [.container 3]
+    expected: FAIL
+
+  [.container 4]
+    expected: FAIL
+
+  [.container 5]
+    expected: FAIL
+
+  [.container 6]
+    expected: FAIL
+
+  [.container 7]
+    expected: FAIL
+
+  [.container 8]
+    expected: FAIL
+
+  [.container 9]
+    expected: FAIL
+
+  [.container 10]
+    expected: FAIL
+
+  [.container 11]
+    expected: FAIL
+
+  [.container 12]
+    expected: FAIL
+
+  [.container 13]
+    expected: FAIL
+
+  [.container 14]
+    expected: FAIL
+
+  [.container 15]
+    expected: FAIL