fix(compiler-core): warn when slot used on non-root template

[Disservin]

Implements the warning from vue2 in vue3.

fixes #11521

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB	37.7 kB	33.9 kB
vue.global.prod.js	159 kB (+133 B)	57.6 kB (+68 B)	51.2 kB (+103 B)

Usages

Name	Size	Gzip	Brotli
createApp	55.1 kB	21.2 kB	19.3 kB
createSSRApp	59.1 kB	22.9 kB	20.8 kB
defineCustomElement	59.8 kB	22.7 kB	20.7 kB
overall	68.8 kB	26.3 kB	23.9 kB

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❌ Deploy Preview for vue-next-template-explorer failed.

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[Disservin]

I moved it out of the parser and into the transform, I think this makes more sense?

[pkg-pr-new]

commit: 3e245ae

@vue/compiler-core

pnpm add https://pkg.pr.new/@vue/compiler-core@11569

@vue/compiler-dom

pnpm add https://pkg.pr.new/@vue/compiler-dom@11569

@vue/compiler-sfc

pnpm add https://pkg.pr.new/@vue/compiler-sfc@11569

@vue/compiler-ssr

pnpm add https://pkg.pr.new/@vue/compiler-ssr@11569

@vue/reactivity

pnpm add https://pkg.pr.new/@vue/reactivity@11569

@vue/runtime-core

pnpm add https://pkg.pr.new/@vue/runtime-core@11569

@vue/runtime-dom

pnpm add https://pkg.pr.new/@vue/runtime-dom@11569

@vue/server-renderer

pnpm add https://pkg.pr.new/@vue/server-renderer@11569

@vue/shared

pnpm add https://pkg.pr.new/@vue/shared@11569

vue

pnpm add https://pkg.pr.new/vue@11569

@vue/compat

pnpm add https://pkg.pr.new/@vue/compat@11569

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