chore(community-cli-plugin): Remove extraneous `@react-native/metro-babel-transformer` (#49558)

Summary:
Opening this as a separate PR, since I'm not sure if I'm missing something, or if there's any intention behind this.

`react-native/metro-babel-transformer` is used by `react-native/metro-config` and is referenced in code there and as a dependency there. It's also sometimes mentioned as package for community CLI users to install directly. However, there's seemingly no reason `react-native/metro-babel-transformer` needs to depend on it, or any code that relies on it directly.

## Changelog:

[INTERNAL] [CHANGED] - Remove extraneous `react-native/metro-babel-transformer` dependency from community-cli-plugin

Pull Request resolved: https://github.com/facebook/react-native/pull/49558

Test Plan: - n/a

Reviewed By: robhogan

Differential Revision: D69926109

Pulled By: huntie

fbshipit-source-id: b89b54890248de4954e5c0ce4afe3a5cb5bfa2c1