[OPIK-402]: handle project name and score definitions for evaluate();

[aadereiko]

Details

• Now, the scores during evaluate work properly. They handle the project_name correctly
• I wanted to write some tests but for the time being, there is no way to get the project info by a name. So, it's best to do it after the BE is ready

Issues

Resolves #553

Testing

Documentation

[alexkuzmik]

It should be just project_name: Optional[str] without the default value.
There is no real need for the default value because we call this function in one place only and pass project_name explicitly.
Such arguments with the default value in the middle of the processing pipeline often lead to unnoticed bugs.