Adjust the Louisiana school readiness tax credit to match model standards

[PavelMakarchuk]

Current issues:

• not included in the net income tree

• refundable and non refundable credits are summarized in one file credit variable; should be kept separate

• variable file name does not match class

[PavelMakarchuk]

Similar changes as done in #4504 to the Louisiana CDCC variables

[masterismail]

@PavelMakarchuk , is the implementation exactly the same as #4504 ? What testing methodology did you use to write the tests ? I've been trying to solve this issue here

[PavelMakarchuk]

@PavelMakarchuk , is the implementation exactly the same as #4504 ? What testing methodology did you use to write the tests ? I've been trying to solve this issue here

The implementation is similar, given the difference in the program specifics, you can also see the unit testing framework in #4505