Head-manager: Add support of next-head-count query selector in the whole document

[ermolaevalexey]

Describe the feature you'd like to request

For now, by default, when rendering the app head, next searches for meta[name=next-head-count] in the document's root head. https://github.com/vercel/next.js/blob/master/packages/next/client/head-manager.ts#L37

But if the application is running as a part of common layout, this meta tag is found in body,
like here, #8220 (comment)
so we getting an error
head-manager.ts:49 Uncaught (in promise) TypeError: Cannot read property 'content' of null, so description and other meta tags cannot be set on client side.

Describe the solution you'd like

it would be nice to change the query selector to
const headCountEl = document.querySelector('meta[name=next-head-count]');, so it can be searched in the whole document.

Describe alternatives you've considered

For now this is the only solution I see

[timneutkens]

Running Next.js inside of another page is not supported.

[balazsorban44]

This issue has been automatically locked due to no recent activity. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.