Improved Vercel build output for Observability improvements

[tobiaslins]

Extending the build output to mimic the use of multiple functions being deployed. This improved the observability feature on Vercel for sveltekit projects

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Latest commit: 122c677

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[github-actions]

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[Rich-Harris]

made a couple more tweaks in #13679, and it's working beautifully on svelte.dev, so will close this. thank you!