fix(comms/dht): fixes invalid peer ban on invalid encrypted msg signature #4519
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Description
Motivation and Context
Ref #4339
Previously, a sender may send a message with an invalid encrypted signature that cannot be validated and rejected by intermediate nodes. On receipt by the sender, an invalid signature is encountered and previously this would result in sending peer being banned. This PR changes this to only discard the message. The sender is only banned if unencrypted header data is malformed/invalid.
How Has This Been Tested?
New unit tests + existing tests + manually (no breaking changes)