feat: Add ingestion support for AZContributor on MGMT Groups, RGs, and Subscriptions - BED-5023

[StranDutton]

Motivation and Context

Resolves BED-5023

Why is this change required? What problem does it solve?

AzureHound is being updated to collect AZContributor role assignments for Management Groups, Resource Groups, and Subscriptions (emitting new Kind values: AZManagementGroupContributor, AZResourceGroupContributor, AZSubscriptionContributor) in this PR. However, BHCE's ingestion pipeline had no mapping for these Kinds. The getKindConverter falls through to the default case when it encounters these new Kinds, which just drops the data. This PR adds the missing ingestion logic so these relationships are created in the graph.

Please see this writeup (on Notion) for more context about the problem.

How Has This Been Tested?

Unit tests are TBD - waiting to work more on this until I get more eyes on this.
See this PR for full testing notes (which are currently TBA).

Screenshots (optional): TBD

Types of changes

• New feature (non-breaking change which adds 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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[StranDutton]

Literally ALL jobs are failing right now but that is to be expected because the new types are dependent on the next AzureHound release which isn't out yet obviously.

I'm just preemptively making the changes here as a proof of concept and will come back and polish and fix things when I make progress on AzureHound 🫡 🤠