Bug 1880935 [wpt PR 44666] - Update wpt metadata, a=testonly

wpt-pr: 44666
wpt-type: metadata

testing/web-platform/meta/shared-storage/setters-long-string.tentative.https.sub.html.ini

@@ -0,0 +1,12 @@
+[setters-long-string.tentative.https.sub.html]
+  [sharedStorage.set with key length too big]
+    expected: FAIL
+
+  [sharedStorage.set with value length too big]
+    expected: FAIL
+
+  [sharedStorage.set with max allowed key length]
+    expected: FAIL
+
+  [sharedStorage.set with max allowed value length]
+    expected: FAIL