[core] Remove `'use client'` from index files and useAutocomplete reexport

[DiegoAndai]

Remove 'use client' from:

• index files
• useAutocomplete material-ui reexport file. This required a minor modification of the buildRsc script.

This is to avoid an issue with Next.js that surfaced in https://github.com/mui/material-ui/pull/41596:

Error: It's currently unsupported to use "export *" in a client boundary. Please use named exports instead.

Also suggested in https://github.com/mui/material-ui/pull/40358#issuecomment-1872254225. There's no use of 'use client' in index files.

[mui-bot]

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[oliviertassinari]

Nice, a continuation of https://github.com/mui/material-ui/pull/40663.

I'm confused to why Next.js can't properly handle "use client" in barrel files, it sounds off. But in any cases, it makes sense to me to toggle between client and server bundles at the lowest possible level.

I proposed the same change for Base UI: https://github.com/mui/base-ui/issues/330

[Janpot]

@DiegoAndai I'm adding the following to the no-restricted-syntax rule in eslint to prevent the pattern from re-entering in the future:

{
  message: "The 'use client' pragma can't be used with export * in the same module. This is not supported by Next.js.",
  selector: 'ExpressionStatement[expression.value="use client"] ~ ExportAllDeclaration',
},

[DiegoAndai]

Thanks @Janpot 😊