For #11404 - Create the open_all_in_new_tabs metric in Glean

Expiration date is set to the same of others bookmark metrics.

app/metrics.yaml

@@ -2456,6 +2456,23 @@ bookmarks_management:
     metadata:
       tags:
         - Bookmarks
+  open_all_in_new_tabs:
+    type: event
+    description: |
+      A user opened a folder of bookmarks at once in new tabs.
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/974
+      - https://github.com/mozilla-mobile/fenix/issues/11404
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/21212
+    data_sensitivity:
+      - interaction
+    notification_emails:
+      - android-probes@mozilla.com
+    expires: never
+    metadata:
+      tags:
+        - Bookmarks
   open_in_private_tab:
     type: event
     description: |