fix: map update in the api playground

[abvthecity]

Fixes FER-2399, FER-2637

Short description of the changes made

• api playground state update is not typesafe— map form onChange handler will now check if the onChange event is potentially a dispatch (callback)

What was the motivation & context behind this PR?

https://buildwithfern.slack.com/archives/C073J6QBX1V/p1720620268434399

How has this PR been tested?

spun up a dev URL and tested locally: https://rightbrain.docs.dev.buildwithfern.com/api-reference/tasks/create-task

[linear]

FER-2399 [Hume, Rightbrain] Update method does not allow value updates, only key additions

Pete said:

also for the update method, it only allows you add a key, but the value remains blank so you cant update

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[linear]

FER-2637 [Monite] Small issue with the front-end of the API Playground: closed dropdowns of union fields should show the selected option

Helen Kosova said:

Small FE issue - API Playground - closed dropdowns of union fields should indicate the selected option