Remove name and metadata from root package.json (#54521)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/54521

Following D86869721, this removes the unused `name`, `version`, and `license` fields from the project level `package.json` (previously named `react-native/monorepo`).

**Motivation**

- **Simplicity**: Our root package.json is a Yarn project manifest, not a package, with the `version` field serving no functional purpose. `react-native/monorepo` was never published to npm, and so `name`, `version`, and `license` were never read.
- **Correctness**: Since D86869721 and our recent work to formalise monorepo dependencies in `private/`, the workspace root no longer needs to be referenced by any part of our containing fbsource codebase — and this is a conceptual footgun (Yarn-installing a package that is itself a workspace). `react-native/monorepo` no longer needs to be named, addressable, or installable.

Or, phrased another way:

- Delete `name` — never try to reference this as an npm package!
- Delete `version` — never think about versioning this file!
- Delete `license` — unread, duplicate of `LICENSE.md`.

Changelog: [Internal]

Reviewed By: yungsters

Differential Revision: D86869720

fbshipit-source-id: dcc5fd33bb8c2354d94306e3fb37bbae3f4af43e