ci: Refactor NeMo-ci by introducing a reusable workflow template

[ko3n1g]

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[ko3n1g]

Hey @pablo-garay, this is a poc for the discussed refactoring approach. If you like it, I will continue refactoring the remaining test cases. Please feel free to leave some comments!

[github-actions]

This PR is stale because it has been open for 14 days with no activity. Remove stale label or comment or update or this will be closed in 7 days.