fix: fixes type hints and simplifies ToRules yaml transformer

[jpower432]

Description

Fixes type hinting issues in yaml_transformer.py.

Type of change

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

How has this been tested?

N/A

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules