[release-12.1.1] Alerting: Add rule group name validation to the Prometheus conversion API #108767
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Backport f969eb0 from #108740
What is this feature?
Adds rule group name validation to the the Alerting Prometheus conversion API. Currently it's possible to send a rule group with an empty name, and this PR makes this impossible.
Also improves error handling in the conversion API by propagating error messages to API responses.