Stabilize createQueryPreloader/preloadQuery API

[jerelmiller]

This is a tracking issue to ensure we remove the @experimental tag for the createQueryPreloader and preloadQuery APIs in 3.10. This feature is experimental in 3.9 in case we need to make tweaks to the API design.

[alessbell]

Going to close this one out since this has been updated in the release-3.10 which is in its RC stage 🎉

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