Bug 1632258 [wpt PR 23181] - Update wpt metadata, a=testonly

wpt-pr: 23181
wpt-type: metadata

testing/web-platform/meta/shadow-dom/slots-imperative-api-slotchange.tentative.html.ini

@@ -0,0 +1,22 @@
+[slots-imperative-api-slotchange.tentative.html]
+  [slotchange event must not fire synchronously.]
+    expected: FAIL
+
+  [Fire slotchange event when order of assigned nodes changes.]
+    expected: FAIL
+
+  [slotchange event should not fire when assignments do not change assignedNodes.]
+    expected: FAIL
+
+  [Fire slotchange event when slot's assigned nodes changes.]
+    expected: FAIL
+
+  [Fire slotchange event on previous slot and new slot when node is reassigned.]
+    expected: FAIL
+
+  [slotchange event should not fire when same node is assigned.]
+    expected: FAIL
+
+  [Fire slotchange event on node assignment and when assigned node is removed.]
+    expected: FAIL
+