CI: Validate support with Grafana v13

[amotl]

Grafana 13 was released in April 2026 already.

• https://grafana.com/docs/grafana/latest/whatsnew/whats-new-in-v13-0/
• https://grafana.com/docs/grafana/latest/whatsnew/whats-new-in-v13-1/

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch grafana-13.1.0

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