Change all std::filesystem::exists calls to noexcept overload

[souvik1914581]

We are using an overload of std:: filesystem :: exists()
which can throw exception in a lot of places (please see screenshot).

We are also using an overload of std:: filesystem :: exists()
which does not throw any exception (noexcept version).

We should change all calls to std::filesystem::exists to the noexcept overload for consistency and for more exception safety.

Refer : https://en.cppreference.com/w/cpp/filesystem/exists