Add iterators to unified resource cache #52103
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This updates the UnifiedResourceCache with IterateResources as an alternative to IterateUnifiedResources. The new function returns an iterator instead of collecting and returning a page of results. While this API may not entirely replace the current one, it offers a better way for users that just want to iterate resources without collecting them. Additionally, a few helper methods were included for callers that might wish to only iterate one specific resource type. Internally the UnifiedResourceCache was refactored to use the same logic for all exposed iteration methods.