Draft: Add skip condition on endpoint definition

[SYoder1]

Adds a skip condition function to the endpoint definition to "skip" making the network request when returned true. Instead of needing to set the skip on every query hook it can be applied at a more global layer.

In order to keep isUninitialized set to true, the same way it works with skip on the hook, I needed to add a check for it in the useQuery hook.

Closes #4810

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