feat: warn not to use centaurs

[artemrys]

Description

Warn when centaurs is used.

Checklist

• README.md has been updated or is not required
• push trigger tests
• manual release test
• automated releases test
• pull request trigger tests
• schedule trigger tests
• workflow errors/warnings reviewed and addressed

Testing done

• https://github.com/splunk/splunk-add-on-for-microsoft-office-365/actions/runs/17073350867/job/48408007804?pr=863

[mbruzda-splunk]

We could use github warning message so the message gets formatted nicely in github workflow view

https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-commands#setting-a-warning-message

[srv-rr-github-token]

🎉 This PR is included in version 5.1.0 🎉

The release is available on GitHub release

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