Install NGINX Agent

[alessfg]

Proposed changes

This PR adds the ability to use this role to install the NGINX Agent and configure it to connect to the NGINX One SaaS console. To do before merging:

• [x] Fix Alpine tests
• [x] Cleanup instances from NGINX One after testing

Checklist

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

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

[github-actions[bot]]

CLA Assistant Lite bot All required contributors have signed the F5 CLA for this PR ✅

[oliveromahony]

I have hereby read the F5 CLA and agree to its terms

[oCHRISo]

I have hereby read the F5 CLA and agree to its terms

[oCHRISo]

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