Set scheduling termination reason when scheduling constraint hit (#3655)

This will make it clear if the scheduling round finished early due to hitting a constraint (rate limit, resource scheduling limit)

Currently it just says "no remaining candidate jobs" even if actually the reason the scheduling ended was because we hit a limit

Signed-off-by: JamesMurkin <jamesmurkin@hotmail.com>

internal/scheduler/queue_scheduler.go

@@ -112,6 +112,7 @@ func (sch *QueueScheduler) Schedule(ctx *armadacontext.Context) (*SchedulerResul
 		} else if schedulerconstraints.IsTerminalUnschedulableReason(unschedulableReason) {
 			// If unschedulableReason indicates no more new jobs can be scheduled,
 			// instruct the underlying iterator to only yield evicted jobs from now on.
+			sch.schedulingContext.TerminationReason = unschedulableReason
 			sch.candidateGangIterator.OnlyYieldEvicted()
 		} else if schedulerconstraints.IsTerminalQueueUnschedulableReason(unschedulableReason) {
 			// If unschedulableReason indicates no more new jobs can be scheduled for this queue,