BED-5080 - remove additional integer types from SQL schema

[zinic]

Description

Removing more int32 cruft.

Motivation and Context

Without this change, type casting using the PgSQL composite types will fail due to the use of int4 width ID types.

How Has This Been Tested?

Regression test added.

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