fix(detectors): Make AlertRuleDetector.objects filter out pending deletion Detectors by default #248532

Job	Run time
detect what files changed	11s
select tests	35s
cli test	1m 55s
backend migration tests	9m 8s
api docs test	5m 55s
monolith-dbs test	7m 7s
backend typing	4m 33s
check migration	1m 1s
requirements check	0s
api url typescript generation	0s
calculate test shards	6s
backend test (1)	7m 24s
backend test (0)	6m 38s
Backend	3s
	44m 36s

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