Resolve "Include buildDate and scanDate in VAT import"

Closes #597 (closed)

Here is a snippet from vat_request.json in staging:

{
  "imageName": "redhat/ubi/ubi8",
  "imageTag": "8.6",
  "parentImageName": "",
  "parentImageTag": "",
  "jobId": "2841",
  "digest": "1615aca077e2b34ea2b3807c5aea81dccb27cf60243d64be9d398fb76b75c22b",
  "timestamp": "2022-07-13T19:29:06Z",
  "scan_date": "2022-07-13T19:25:52Z",
  "build_date": "2022-07-13T19:25:52Z",
  "repo": {
    "url": "https://code-ib-zelda.staging.dso.mil/dsop/redhat/ubi/ubi8",
    "commit": "7b541d2816636207c23d3e813ed9ca506fe0b28d"
  },