v2.0: gossip: demote invalid duplicate proof errors to info (backport of #2754) #2759
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Problem
Misconfigured or malicious nodes can send out duplicate proofs that are invalid.
This will result in a lot of ERROR log spam.
Summary of Changes
Separate out logging to use INFO for invalid duplicate proofs, and ERROR for errors in the processing pipeline.
This is an automatic backport of pull request #2754 done by [Mergify](https://mergify.com).