Update Molecule CI/CD to support NGINX 1.25.2

[alessfg]

Proposed changes

• Reimplement some platforms in the upgrade & downgrade Molecule scenarios since all platforms now have at least two releases.
• Replace the hardcoded NGINX version check in multiple Molecule scenarios with a dynamic NGINX version check.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have added Molecule tests that prove my fix is effective or that my feature works
• I have checked that any relevant Molecule tests pass after adding my changes
• I have updated any relevant documentation (defaults/main/*.yml, README.md and CHANGELOG.md)