test(v2): update nitro v3 fixture to alpha.2

[birkskyum]

This also removes some unused imports on nitro plugin

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Latest commit: 8f96d5e

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npm i https://pkg.pr.new/solidjs/solid-start/@solidjs/start@2079

npm i https://pkg.pr.new/solidjs/solid-start/@solidjs/vite-plugin-nitro-2@2079

commit: 8f96d5e