Keep useFacetCallback instance same even if facets instances change

[vb]

• This PR refactors the callback (useCallback) returned from useFacetCallback
• Previously, the callback had the facets (originally passed to useFacetCallback) in its dependency array, meaning it would return a new instance of the callback when the facets were modified
• This PR removes the facets from the dependency array and instead puts them in a ref.
• The callback then reads from the ref to get the current facet values