Silence OpenSearch timeout errors in SearchUserSolutions (#8350)

The rescue block already falls back to a DB query gracefully,
so reporting these expected timeouts to Bugsnag is unnecessary noise.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: iHiD

app/commands/solution/search_user_solutions.rb

@@ -40,8 +40,7 @@ def call
     total_count = results["hits"]["total"]["value"].to_i
     Kaminari.paginate_array(solutions, total_count:).
       page(page).per(per)
-  rescue StandardError => e
-    Bugsnag.notify(e)
+  rescue StandardError
     Fallback.(user, page, per, track_slug, status, mentoring_status,
       criteria, order, sync_status, tests_status, head_tests_status)
   end