fix: update oid property to certtemplateoid to match documentation

[urangel]

Description

The property oid was renamed to certtemplateoid

Motivation and Context

certtemplateoid is what has been documented to have this property named as and this is the property name that the logic in BloodHound pivots off of for creating ExtendedByPolicy edges.

How Has This Been Tested?

Two unit tests were added.

Screenshots (if appropriate):

Types of changes

• [ ] Chore (a change that does not modify the application functionality)
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] Documentation updates are needed, and have been made accordingly.
• [x] I have added and/or updated tests to cover my changes.
• [x] All new and existing tests passed.
• [ ] My changes include a database migration.