Remove SampleTurboCxxModule example (#52442)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52442

Changelog: [Internal]

The sample is from an outdated approach of enabling C++ Modules in RN which is not recommended anymore.

Prefer C++ Turbo Modules if you need to expose / access C or C++ APIs in RN apps:

https://reactnative.dev/docs/the-new-architecture/pure-cxx-modules

It is not included in any RNTester app at this time

Reviewed By: cortinico

Differential Revision: D77771111

fbshipit-source-id: a4fe1d13fd0224babc46f54b921a036f7b237a48