fix: remove startTransition so mutation hook could update immediately

[promer94]

Currently the mutate hook state is updated in startTransition. So when it is used with server action, it won't flush the state update into dom immediately.

close: #2653

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Issue	Status
Install scripts	✅ 0 issues
Native code	✅ 0 issues
Bin script shell injection	✅ 0 issues
Unresolved require	✅ 0 issues
Invalid package.json	✅ 0 issues
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📊 Modified Dependency Overview:

⬆️ Updated Package	Version Diff	Added Capability Access	+/- Transitive Count	Publisher
@swc/core@1.3.62	1.3.56...1.3.62	None	+0/-0	kdy1
@types/node@20.2.5	18.16.3...20.2.5	None	+0/-0	types
@playwright/test@1.34.3	1.33.0...1.34.3	None	+2/-2	aslushnikov
@typescript-eslint/parser@5.59.8	5.59.2...5.59.8	None	+10/-9	jameshenry
@types/react-dom@18.2.4	18.0.10...18.2.4	None	+0/-3	types
bunchee@3.2.0	3.1.1...3.2.0	None	+1/-1	huozhi
@typescript-eslint/eslint-plugin@5.59.8	5.59.2...5.59.8	None	+13/-11	jameshenry
eslint@8.42.0	8.39.0...8.42.0	None	+5/-7	eslintbot
eslint-plugin-jest-dom@5.0.1	4.0.3...5.0.1	None	+6/-11	benmonro
eslint-plugin-testing-library@5.11.0	5.10.3...5.11.0	None	+6/-9	testing-library-bot
@types/jest@29.5.2	29.5.1...29.5.2	None	+1/-10	types
rimraf@5.0.1	5.0.0...5.0.1	None	+2/-2	isaacs

🚮 Removed packages: @next/font@13.1.6, @types/react@18.2.5, next@13.3.4, typescript@4.9.4, typescript@5.0.4

[sebmarkbage]

This doesn't seem like the right fix and is a breaking change.

Seems like only the isMutating flag should be outside the startTransition or better yet, use the isPending flag from useTransition.