mgmt computeschedule, rename ActionType (Azure#35960)

* rename ActionType

* fix tsp

* tsp compile

* use clientName instead

Revert "fix tsp"

This reverts commit 5569b04.

Author: XiaofeiCao

specification/computeschedule/ComputeSchedule.Management/client.tsp

@@ -150,3 +150,4 @@ using Microsoft.ComputeSchedule;
   "V2025-05-01",
   "javascript"
 );
+@@clientName(Microsoft.ComputeSchedule.ActionType, "ScheduledActionType");