Add support to the `Info` field in the body of query API responses

[rapphil]

Is your feature request related to a problem? Please describe. No

Describe the solution you'd like

Starting with Prometheus 2.54.0, the response body of query APIs will have a info field that is used to store potential query issues, that may or may not be a false positive. To maintain Prometheus compatibility, we should support to this field in cortex as well.

References

https://github.com/prometheus/prometheus/pull/14327 https://github.com/prometheus/prometheus/pull/14429/