chore(sfc-playground): dynamically set Vue version in downloaded project

[jh-leong]

• Replacing the static Vue version in package.json with the version selected by the user
• Using "latest" as the default Vue version if none is selected

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB	38.1 kB	34.3 kB
vue.global.prod.js	158 kB	58 kB	51.6 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.5 kB	18.2 kB	16.7 kB
createApp	54.5 kB	21.3 kB	19.5 kB
createSSRApp	58.7 kB	23 kB	21 kB
defineCustomElement	59.4 kB	22.9 kB	20.8 kB
overall	68.6 kB	26.4 kB	24 kB

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commit: a5ac2b6