Configure `@react-native-community/eslint-config` as a yarn workspace (#34423)

Summary:
Changes the React Native base ESLint configuration to consume `react-native-community/eslint-config` as a [yarn workspace](https://classic.yarnpkg.com/lang/en/docs/workspaces/), so that any dependencies of `react-native-community/eslint-config` can also be resolved from the root directory of `react-native`.

Previously, `~/.eslintrc.js` extended `react-native-community/eslint-config` using a relative file path. This is problematic because if any dependencies (notably, optional peer dependencies such as some of the TypeScript dependencies) are not already installed at the root directory of `react-native`, running ESLint could fail to resolve any required dependencies. In other words, there was an implicit dependency that `react-native/yarn.lock` would also contain any dependencies required by `react-native/packages/eslint-config-react-native-community/yarn.lock`.

With this change, running `yarn` from the root directory of `react-native` will also install any dependencies of `react-native-community/eslint-config`, and it will also symlink `react-native/node_modules/react-native-community/eslint-config` to `../../packages/eslint-config-react-native-community` (meaning any local changes to the config will still be reflected during active development).

## Changelog

[Internal]

Pull Request resolved: https://github.com/facebook/react-native/pull/34423

Test Plan:
Successfully install dependencies and run ESLint.

```
$ cd react-native
$ yarn
$ yarn lint
```

Successfully run Danger on https://github.com/facebook/react-native/pull/34401 (which would previously fail because `typescript-eslint/eslint-plugin` could not be resolved from the root directory of `react-native`):

```
$ cd react-native/bots
$ yarn
$ node ./node_modules/.bin/danger pr https://github.com/facebook/react-native/pull/34401
```

Reviewed By: NickGerleman

Differential Revision: D38710285

Pulled By: yungsters

fbshipit-source-id: a06ceea0884a90be60f6f5db9a5d42be52a951d5