Cherry-pick #15712 to 7.x: [Metricbeat]Log prometheus errors instead of parsing families #15961
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Cherry-pick of PR #15712 to 7.x branch. Original message:
Solves #15709
Some users have been reporting errors fetching prometheus endpoints that include logs stating format errors decoding families.
Most probably metricbeat's prometheus helper has been trying to parse errors received as metric families. This PR adds the HTTP status code to the error sent upstream from the helper and also allows for writing the error body to log when debug is enabled.