fix: CollectDirtyChildren causing app to hang when saving object with many pointers #623

Job	Run time
tests (test:ios)	12m 54s
tests (test:ios)	9m 56s
docs	1m 6s
docs	1m 14s
tests (test:macos)	3m 44s
tests (test:macos)	5m 49s
tests (test:parse_live_query:all)	3m 28s
tests (test:parse_live_query:all)	3m 2s
tests (xcode14)	8m 21s
tests (xcode14)	6m 59s
tests (xcode15)	8m 39s
tests (xcode15)	2m 6s
tests (xcode16)	11m 26s
tests (xcode16)	19s
	1h 19m 3s

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