Add posibitity to set weight for test to allowe better customization for autograder pipeline

[david-jezek]

Some test are more important then others, so it will be great to able set to each test weight which will be used by autograder to calculate resulted points.

This could be easily done using suffix of test name. For example test with name "inheritance_testOfExistance_2" will have weight 2 because last occurrence of '_' is followed by number which represent weight.

In some particular test weight could be 0.