`@remotion/studio`: Don't allow APIs to be called in a read-only Studio

[JonnyBurger]

Fixes #3782

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Name	Status	Preview	Comments	Updated (UTC)
bugs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 11, 2024 8:47am
remotion	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 11, 2024 8:47am
remotion-convert	🛑 Canceled (Inspect)			Oct 11, 2024 8:47am