Auto merge of #24492 - gterzian:update_timer_scheduler, r=asajeffrey

Update timer scheduler to use crossbeam

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It seems time to update the timer scheduler implementation to use crossbeam constructs.

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components/script/timers.rs

@@ -285,7 +285,7 @@ impl OneshotTimers {
                 delay,
             );
             self.scheduler_chan
-                .send(TimerSchedulerMsg::Request(request))
+                .send(TimerSchedulerMsg(request))
                 .unwrap();
         }
     }