Rename metadata directories

This renames:
 - `tests/wpt/metadata` → `tests/wpt/meta-legacy-layout`
 - `tests/wpt/metadata-layout-2020` → `tests/wpt/meta`
 - `tests/wpt/mozilla/meta` → `tests/wpt/mozilla/meta-legacy-layout`
 - `tests/wpt/mozilla/meta-layout-2020` → `tests/wpt/mozilla/meta`

tests/wpt/meta/css/css-flexbox/alignment/flex-align-baseline-flex-001.html.ini

@@ -0,0 +1,72 @@
+[flex-align-baseline-flex-001.html]
+  [.target > * 1]
+    expected: FAIL
+
+  [.target > * 3]
+    expected: FAIL
+
+  [.target > * 5]
+    expected: FAIL
+
+  [.target > * 7]
+    expected: FAIL
+
+  [.target > * 9]
+    expected: FAIL
+
+  [.target > * 11]
+    expected: FAIL
+
+  [.target > * 13]
+    expected: FAIL
+
+  [.target > * 15]
+    expected: FAIL
+
+  [.target > * 17]
+    expected: FAIL
+
+  [.target > * 19]
+    expected: FAIL
+
+  [.target > * 21]
+    expected: FAIL
+
+  [.target > * 23]
+    expected: FAIL
+
+  [.target > * 25]
+    expected: FAIL
+
+  [.target > * 27]
+    expected: FAIL
+
+  [.target > * 29]
+    expected: FAIL
+
+  [.target > * 31]
+    expected: FAIL
+
+  [.target > * 33]
+    expected: FAIL
+
+  [.target > * 35]
+    expected: FAIL
+
+  [.target > * 37]
+    expected: FAIL
+
+  [.target > * 39]
+    expected: FAIL
+
+  [.target > * 41]
+    expected: FAIL
+
+  [.target > * 43]
+    expected: FAIL
+
+  [.target > * 45]
+    expected: FAIL
+
+  [.target > * 47]
+    expected: FAIL