fix(compiler-ssr): remove undefined/null class and style attrs

[alex-snezhko]

fix #13228 in SSR mode

Remove undefined/null class or style attributes from SSR output to match the documented behavior https://vuejs.org/guide/essentials/template-syntax.html#attribute-bindings

Note: this is a breaking change due to the changes to ssrRenderClass/ssrRenderStyle which are exposed to users from the vue/server-renderer package. New functions can be created to avoid the breaking change but I feel it's worthwhile since the updated implementation matches that of ssrRenderAttrs

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[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
compiler-dom.global.prod.js	84.1 kB	29.8 kB	26.3 kB
runtime-dom.global.prod.js	104 kB	39.1 kB	35.2 kB
vue.global.prod.js	162 kB	59.3 kB	52.8 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	47.1 kB	18.4 kB	16.9 kB
createApp	56 kB	21.6 kB	19.7 kB
createApp + vaporInteropPlugin	68.5 kB	25.8 kB	23.6 kB
createVaporApp	20.9 kB	8.26 kB	7.56 kB
createSSRApp	60.3 kB	23.3 kB	21.3 kB
defineCustomElement	61 kB	23.1 kB	21.1 kB
overall	70.5 kB	26.8 kB	24.4 kB

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commit: 8607414