Remove unnecessary enable_shared_from_this from built-in C++ TMs (#43506)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/43506

Changelog: [internal]

We've been making all the built-in C++ TurboModules in RN extend `enable_shared_from_this` because we copied from the same template that needed it, but none of them do. This removes that unnecessary extension.

Reviewed By: sammy-SC

Differential Revision: D54901332

fbshipit-source-id: 795c7696e70041d640399e3b9f177999e22fd90b