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/css/css-align/parsing/justify-items-computed.html.ini

@@ -0,0 +1,60 @@
+[justify-items-computed.html]
+  [Property justify-items value 'normal']
+    expected: FAIL
+
+  [Property justify-items value 'stretch']
+    expected: FAIL
+
+  [Property justify-items value 'baseline']
+    expected: FAIL
+
+  [Property justify-items value 'last baseline']
+    expected: FAIL
+
+  [Property justify-items value 'center']
+    expected: FAIL
+
+  [Property justify-items value 'start']
+    expected: FAIL
+
+  [Property justify-items value 'end']
+    expected: FAIL
+
+  [Property justify-items value 'self-start']
+    expected: FAIL
+
+  [Property justify-items value 'self-end']
+    expected: FAIL
+
+  [Property justify-items value 'flex-start']
+    expected: FAIL
+
+  [Property justify-items value 'flex-end']
+    expected: FAIL
+
+  [Property justify-items value 'unsafe center']
+    expected: FAIL
+
+  [Property justify-items value 'safe self-end']
+    expected: FAIL
+
+  [Property justify-items value 'right']
+    expected: FAIL
+
+  [Property justify-items value 'safe left']
+    expected: FAIL
+
+  [Property justify-items value 'legacy']
+    expected: FAIL
+
+  [Property justify-items value 'legacy left']
+    expected: FAIL
+
+  [Property justify-items value 'legacy right']
+    expected: FAIL
+
+  [Property justify-items value 'legacy center']
+    expected: FAIL
+
+  [justify-items legacy depends on inherited value]
+    expected: FAIL