always proxy to @react-native-community/cli (#45464)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/45464

Previous work would cause versions >= react-native 0.76 to exit if called through `npx react-native <cmd>`. This was intended to be full deprecated and removed.  The intention was to shift users to calling react-native-community/cli directly.

This change allows commands to be proxied to react-native-community/cli but with no guarantees of success.  It's up to each framework / project to explicitly create that dependency.

This also  provides warnings, which won't go away, suggesting the supported method of calling the community CLI directly.

The outcome is that we're not going to break existing workflows.

closes: #45461

Changelog: [General][Fixed] allow proxying commands from react-native to react-native-community/cli with explicit warning

Reviewed By: cortinico

Differential Revision: D59805357

fbshipit-source-id: 21e23b082a9c709effa050d8e7dd04a40f5ab0e6