chore: custom node kinds cleanup BED-8537

[AD7ZJ]

Description

Now that custom_node_kinds is a full description of node kinds, we can shore up the various areas that are looking in multiple areas for node kinds.

Motivation and Context

Resolves https://specterops.atlassian.net/browse/BED-8537

How Has This Been Tested?

Updates to unit tests

Screenshots (optional):

Types of changes

• Chore (a change that does not modify the application functionality)

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

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