refs https://github.com/TryGhost/Product/issues/3832
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### <samp>🤖 Generated by Copilot at adffb67</samp>
This file updates the global form select component to use a custom
`ReactSelect` component with better performance and style.
refs https://github.com/TryGhost/Product/issues/3349
- Simplified a few more places after switching to react-query
- Improved how mocking works in specs to be more scalable as the number
of queries increases