Add integration test for Rust project template

[alxkzmn]

Problem

Currently any error in the Rust project initial template would not be obvious to a developer until they run mopro init and then try to build the template project because the template code is not a module of the crate. E.g., any error in https://github.com/zkmopro/mopro/blob/main/cli/src/template/init/build.rs would not lead to the whole mopro project compilation error.

Details

An integration test should try to build the template code to detect any errors.

Acceptance criteria

A test should be created that is equivalent to running a mopro init and mopro build commands. The test should be a part of the GitHub workflow.