fix: Update useActionState to add isPending return

[timodwhit]

Resolves #6872.

Also, leverages the examples and notes from: https://github.com/facebook/react/pull/28491 for further examples on isPending.

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Name	Status	Preview	Comments	Updated (UTC)
19-react-dev	❌ Failed (Inspect)			Aug 22, 2024 3:54pm
react-dev	❌ Failed (Inspect)			Aug 22, 2024 3:54pm

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[timodwhit]

Related to: https://github.com/vercel/next.js/pull/69163

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[JakeSaterlay]

Hey there! I worked on something similar here:

https://github.com/reactjs/react.dev/pull/6989#issuecomment-2249916548