Remove vat compare stage from the pipeline

We removed the vat compare stage in #268 (closed). Since the MR related to that ticket was reverted, we'll want to remove the vat compare stage in a separate MR.

We will likely need to reimplement this stage in the pipeline before we reimplement the vat findings api in the pipeline. Since we're not tracking the differences between the query and api while we wait, and we'll likely need to change this code to reflect any changes to the vat api, we can remove it from the pipeline for the time being.