RuntimeExecutor: Remove noexcept from sync ui thread utils (#51514)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/51514

This util can execute arbitrary runtimeWork, which can throw.

In the future, we'll also make these utils execute ui blocks posted from the javascript thread. And those will be able to throw.

Therefore, let's remove the noexcept. Otherwise, if an exception bubbles up to this util, it will just crash this app.

Changelog: [General][Changed] - RuntimeExecutor:  Remove noexcept from sync ui thread utils

Reviewed By: javache

Differential Revision: D75183993

fbshipit-source-id: 6c3a319fe3a76165a265815e6343220cf9db6fde