@docusaurus/Head meta contains data-rh=true, which leads to verification error in Baidu.com and Sogou.com

Have you read the Contributing Guidelines on issues?

[X] I have read the Contributing Guidelines on issues.

Prerequisites

[X] I'm using the latest version of Docusaurus.
[X] I have tried the npm run clear or yarn clear command.
[X] I have tried rm -rf node_modules yarn.lock package-lock.json and re-installing packages.
[X] I have tried creating a repro with https://new.docusaurus.io.
[X] I have read the console error message carefully (if applicable).

Description

generated with @docusaurus/Head is like:

<meta name="xxxxxx-verification" content="xxxxxx" data-rh="true">

Some search engines requires

<meta name="xxxxxx-verification" content="xxxxxx">

, and they are not smart enough verify a meta with data-rh.

Reproducible demo

No response

Steps to reproduce

import Head from '@docusaurus/Head';
        <Head>
            <meta name="baidu-site-verification" content="codeva-xxxxx" />
            <meta name="sogou_site_verification" content="xxxxx" />
        </Head>

Expected behavior

Although those search engines are stupid, but we also should not add anything we won't use. Please remove the "data-rh" property.

<meta name="xxxxxx-verification" content="xxxxxx">

Actual behavior

<meta name="xxxxxx-verification" content="xxxxxx" data-rh="true">

Your environment

Public source code:
Public site URL: https://mactoys.eusoftbank.com
Docusaurus version used:
Environment name and version (e.g. Chrome 89, Node.js 16.4):
Operating system and version (e.g. Ubuntu 20.04.2 LTS):

Self-service

[ ] I'd be willing to fix this bug myself.

facebook / docusaurus

@docusaurus/Head meta contains data-rh=true, which leads to verification error in Baidu.com and Sogou.com #10682