Refactor KSAT training and eval fields

Description of development task:

As a maintainer, I want to remove the training and eval fields in the KSAT files and switch to mongo aggregation to join rel-link information with the KSATs, so the addition of new rel-link and maintainability of the KSATs are easier

Acceptance Criteria:

• remove training and eval fields from all KSAT objects
• convert create data python scripts to use aggregation to join rel-link information with KSATs that are needed at the time