Check if the RunConfiguration is correct should be done before the steps

[mauricioaniche]

We only check if the weights are wrong when GradeCalculator#calculateFinalGrade is called. That only happens at the very end of the process, after compiling, running, and etc. We can move these checks to earlier in the process so that if the teacher made a mistake in the rubric, we get an early error.

One place to do it would be the GetRunConfigurationStep.

[just-rares]

Hello!

[mauricioaniche]

This issue is yours, @just-rares!