remove grafana experimental

[gwdawson]

removes the use of the grafana/experimental package and replaces it with grafana/plugin-ui and grafana/llm

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[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[github-actions]

Use the following command to run this PR with Docker at http://localhost:3000:

docker run --rm -p 3000:3000 grafana/plugin-builds:062cfba72f8c91852df17f0d920dc0b7e70655bcpre