[fenix] Revert "For https://github.com/mozilla-mobile/fenix/issues/11404 - Create the open_all_in_new_tabs metric in Glean"

This reverts commit d4a38b3a2aef401a9a764a135daf72bf6a2baf01.

app/metrics.yaml

@@ -2460,23 +2460,6 @@ 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: |