Feat: Refactor github2gerrit add tests framework #4

Job	Run time
Shell Script Unit Tests	10s
Matrix Tests (ubuntu-20.04, composite)	1s
Matrix Tests (ubuntu-22.04, composite)	8s
Matrix Tests (ubuntu-latest, composite)	7s
Integration Tests	16s
Matrix Tests (ubuntu-latest, reusable)	4s
Security Validation	4s
Matrix Tests (ubuntu-22.04, reusable)	7s
Matrix Tests (ubuntu-20.04, reusable)	1s
Dry Run Integration	0s
	58s

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