fix: serve next run from scheduler state (#2365)

Author: yohamta0

internal/service/frontend/api/v1/dags.go

@@ -2056,10 +2056,30 @@ func (a *API) nextRunProjection(ctx context.Context) func(*core.DAG, time.Time)
 	}
 
 	return func(dag *core.DAG, now time.Time) time.Time {
+		if schedulerState != nil {
+			if nextRun, ok := scheduler.ProjectedNextRun(dag, schedulerState); ok {
+				return nextRun
+			}
+			if hasProfileSchedule(dag) {
+				return time.Time{}
+			}
+		}
 		return scheduler.NextPlannedRun(dag, now.In(location), schedulerState)
 	}
 }
 
+func hasProfileSchedule(dag *core.DAG) bool {
+	if dag == nil {
+		return false
+	}
+	for _, schedule := range dag.Schedule {
+		if schedule.Profile != "" {
+			return true
+		}
+	}
+	return false
+}
+
 // parseIntParam parses an integer string, returning defaultVal if parsing fails or value is <= 0.
 func parseIntParam(s string, defaultVal int) int {
 	if s == "" {