[GEN-1076] Exclude genomic_location_explanation from release

[rxu17]

Purpose: This is a draft PR. This PR is only allowing in certain release variables (excluding out the genomic_location_explanation and Annotation_Status variables for example) for the full maf csv.

Changes:

• Added create_missing_columns in process_functions.py Decided with this implementation on excluding variables because we have older full maf files that may have been processed 1-N releases ago, and doesn't contain new columns and features we added to maf processing since then. Because we append old full maf files and more recently processed maf files, we want to make sure they conform to a specific expected schema so we set the expected columns they should have and if they don't have the column, it's created and filled with missing values.

Testing:

• Unit tests written for the new function
• Ran on consortium and public release aspects of pipeline
• Ran in docker image

Depends on #545

[rxu17]

Also feels like we need to also enforce an expected schema for the full maf file during the end of process_mutation given that we have this new variable genomic_location_explanation.

[dpulls]

🎉 All dependencies have been resolved !

[sonarqubecloud]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

9 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[rxu17]

It was decided to just use a list of release variables for the full maf file to subset out the non-release variables.

[thomasyu888]

🚀 LGTM! Thanks for doing this! I just had one comment, but going to pre-approve!