Update vs sync scan and sync endpoint to account for new cidr_org relation

[jayjaybunce]

…al table matches

🗣 Description

💭 Motivation and context

@DJensen94 updates to the ASM sync operations required changes to the syncing of our organizational assets. This change updates the vulnScanningSync to sent json to /sync rather than csv data. Additionally, this updates the saving of the cidr relations.

🧪 Testing

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All future TODOs are captured in issues, which are referenced
  in code comments.
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All relevant repo and/or project documentation has been updated
  to reflect the changes in this PR.
• Tests have been added and/or modified to cover the changes in this PR.
• All new and existing tests pass.

✅ Pre-merge checklist

• Revert dependencies to default branches.
• Finalize version.

✅ Post-merge checklist

• Create a release.