fix(p2p): log user agent on banning a peer

[hanabi1224]

Summary of changes

We occasionally see a lot of expected banning peer PEER for REASON logs, it'd help troubleshooting the issue to add user agent to the log

Changes introduced in this pull request:

Sample logs:

2024-12-10T00:41:20.357572Z  DEBUG forest_filecoin::libp2p::service: Banning peer peer=12D3KooWJe3QWBUFPa7DBaYLq1BXWcK2LVM39VBawuVz3ePHT45K user_agent= reason=Hello protocol unsupported
2024-12-10T00:41:20.357801Z  DEBUG forest_filecoin::libp2p::service: Banning peer peer=12D3KooWJe3QWBUFPa7DBaYLq1BXWcK2LVM39VBawuVz3ePHT45K user_agent=sophon-messager reason=hello protocol unsupported
2024-12-10T00:41:20.435089Z  DEBUG forest_filecoin::libp2p::service: Banning peer peer=12D3KooWQtcfpAhnu89D3YkyA1ZVXmDBmCLwA62LEfHinfLcHzoL user_agent= reason=Hello protocol unsupported

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

[LesnyRumcajs]

What would be the sample log output now? Let's embed it into the PR description.

[LesnyRumcajs]

Let's have a tracking issue, otherwise it's unlikely anyone will pick it up when browsing the code.

[hanabi1224]

#5064

[hanabi1224]

What would be the sample log output now? Let's embed it into the PR description.

@LesnyRumcajs Done.