Use vat_findings json in csv_output

Currently, we're using BASE_IMAGE and BASE_TAG to query the VAT in the csv-output stage.

To resolve this:

• Use the vat_findings.json file from the lint stage to remove querying the VAT from the csv-output stage and consolidate VAT queries to the lint stage

Acceptance Criteria: The csv_output stage uses the vat_findings.json file generated in the lint stage for whitelist generation.