Add a short-lived lock to trend refresh scheduler (#27253)

app/workers/scheduler/trends/refresh_scheduler.rb

@@ -3,7 +3,7 @@
 class Scheduler::Trends::RefreshScheduler
   include Sidekiq::Worker
 
-  sidekiq_options retry: 0
+  sidekiq_options retry: 0, lock: :until_executed, lock_ttl: 30.minutes.to_i
 
   def perform
     Trends.refresh!