BED-5044 - revert edge constraint map checking in API and prefer SQL upsert

[zinic]

Description

Revert and change for edge creation during post-processing.

Motivation and Context

• Related to BED-4997
• Fixes BED-5044

The changes authored had a far greater impact on memory than expected. This ticket exists to cover reverting the change and authoring a small update to the SQL used for create to change the edge create statement into an edge upsert statement.

How Has This Been Tested?

Local test w/ folk on Zoom.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have met the contributing prerequisites
  • Assigned myself to this PR
  • Added the appropriate labels
  • Associated an issue: Issues and Pull Requests README #672
  • Read the Contributing guide: https://github.com/SpecterOps/BloodHound/wiki/Contributing
• I have ensured that related documentation is up-to-date
  • Open API docs
  • Code comments (GoDocs / JSDocs)
• I have followed proper test practices
  • Added/updated tests to cover my changes
  • All new and existing tests passed

[superlinkx]

Appreciate the in-depth review, all looks good