Update CDS to GC

[jen-dfci]

This notebook:
https://github.com/isb-cgc/Community-Notebooks/blob/master/HTAN/Python%20Notebooks/Creating_CDS_Data_Import_Manifests_Using_BQ.ipynb

will need to be renamed and revised to the new name for CDS -- Genomic Commons.

[fseidl-gdit]

The majority of the references have been updated to General Commons, there are some lingering instances of CDS in the references to field names in BigQuery tables that have not been updated.