Ava Chow 647cdb4f7e Merge bitcoin/bitcoin#33311: net: Quiet down logging when router doesn't support natpmp/pcp
4f1a4cbccd net: Quiet down logging when router doesn't support natpmp/pcp (laanwj)

Pull request description:

  When the router doesn't support natpmp and PCP, one'd normally expect the UDP packet to be ignored, and hit a time out. This logs a message that is already in the debug category. However, there's also the case in which sending an UDP packet causes a ICMP response (type 3, code 3 "port unreachable"). This is returned to user space as "connection refused" (despite UDP having no concept of connections).

  Move the warnings from `Send` and `Recv` to debug level too, to reduce log spam in that case.

  Closes #33301.

ACKs for top commit:
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  sipa:
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  davidgumberg:
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  achow101:
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  darosior:
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  mzumsande:
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Tree-SHA512: 2c99a5679720482ece47af33616b6b207509fb58ba1962a1c2d30f8d0e68554f8f5ef25224313d93f4c5a1cc702183fcf8e6119abc411209c9884119ef680aad
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Bitcoin Core integration/staging tree

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