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-transitions/AnimationEffect-getComputedTiming.tentative.html.ini

@@ -0,0 +1,67 @@
+[AnimationEffect-getComputedTiming.tentative.html]
+  [endDelay of a new transition]
+    expected: FAIL
+
+  [localTime reflects playbackRate immediately]
+    expected: FAIL
+
+  [Negative delay of a new transition]
+    expected: FAIL
+
+  [iterationStart of a new transition]
+    expected: FAIL
+
+  [currentIteration of a new transition]
+    expected: FAIL
+
+  [progress of a finished transition]
+    expected: FAIL
+
+  [localTime is always equal to currentTime]
+    expected: FAIL
+
+  [endTime of a new transition]
+    expected: FAIL
+
+  [Positive delay of a new transition]
+    expected: FAIL
+
+  [fill of a new transition]
+    expected: FAIL
+
+  [iterations of a new transition]
+    expected: FAIL
+
+  [progress of a new transition]
+    expected: FAIL
+
+  [duration of a new transition]
+    expected: FAIL
+
+  [non-default easing of a new transition]
+    expected: FAIL
+
+  [direction of a new transition]
+    expected: FAIL
+
+  [currentIteration of a finished transition]
+    expected: FAIL
+
+  [easing of a new transition]
+    expected: FAIL
+
+  [currentIteration of a new transition with positive delay in before phase]
+    expected: FAIL
+
+  [localTime of a new transition]
+    expected: FAIL
+
+  [progress of a new transition with positive delay in before phase]
+    expected: FAIL
+
+  [activeDuration of a new transition]
+    expected: FAIL
+
+  [delay of a new tranisition]
+    expected: FAIL
+