Add validation rule for uncalled mutations

[inodb]

There should never be mutations that are in both data_mutations.txt and data_mutations_uncalled.txt. The uncalled profile contains all mutations that weren't called, so it is mutually exclusive with the file that contains called mutations. It would be nice to have a check in the validator that confirms this. The logic should be something like:

• check if there exists a mutation file data_mutations_uncalled.txt. If so, there should never be duplicates when you combine it with data_mutations.txt
• indicate which variants are duplicates in the validation report

For test files you can use:

• https://github.com/cBioPortal/datahub/blob/master/public/glioma_msk_2018/data_mutations_uncalled.txt
• https://github.com/cBioPortal/datahub/blob/master/public/glioma_msk_2018/data_mutations.txt

Follow up ticket to: https://github.com/cBioPortal/cbioportal/issues/10126

[skrivit]

Hi, I'd like to work on this. Does it need to be assigned to me?