Allow useCollection to only run when certain conditons are met

[mikejolley]

When working on Attribute Filters there were some cases where we needed to wait for certain data to become available (from the REST API) before passing that data to another REST API request. Queries are performed using useCollection hooks. Hooks cannot be executed or ran conditionally.

To get around this, @nerrad suggested added a callback (or boolean?) to the useCollection hook which would return true/false to as whether or not to run the query yet. In this case, we'd check if the dependency value existed before running the query.

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