DVO-1536: Cleanup some logs

[KA-ROM]

Summary

Reduce log volume on high-frequency paths already covered by metrics. Keep detailed error logs for investigation.

What

• Mirror success log removed: redundant with MirrorSuccessCount metric. Error logs kept with request body detail
  for investigation.
• Websocket "Proxied message" log removed: fired on every flashblock message to every client, highest volume log
  in the codebase. Chaos events now log independently instead of piggybacking on this line.
• Websocket write failure logs added: write failures now include message type, size, and connection addresses for
  debugging.
• Proxy success log gated on enriched triage data: methods without decoded txs or deadlines are skipped in logs as metrics coves the info they expose (mainly affects eth_sendBundle proxy success logs)
• Redundant DecodeEthRawTransaction call fixed: was decoding the same tx twice in prepareLogFields error path.

---

AI generated:

  Top log messages by volume:
  ┌────────────────────────────┬────────────────────┬────────────────┐
  │          Message           │       Proxy        │ Count (of 500) │
  ├────────────────────────────┼────────────────────┼────────────────┤
  │ Mirrored the request       │ bproxy-rpc         │ 156            │
  ├────────────────────────────┼────────────────────┼────────────────┤
  │ Proxied the request        │ bproxy-rpc         │ 114            │
  ├────────────────────────────┼────────────────────┼────────────────┤
  │ Proxied message            │ bproxy-flashblocks │ 100            │
  ├────────────────────────────┼────────────────────┼────────────────┤
  │ Mirrored the request       │ bproxy-authrpc     │ 64             │
  ├────────────────────────────┼────────────────────┼────────────────┤
  │ Proxied the request        │ bproxy-authrpc     │ 46             │
  ├────────────────────────────┼────────────────────┼────────────────┤
  │ Ignoring FCUv3 w/o payload │ bproxy-authrpc     │ 10             │
  ├────────────────────────────┼────────────────────┼────────────────┤
  │ Faked the request          │ bproxy-authrpc     │ 10             │
  └────────────────────────────┴────────────────────┴────────────────┘

  "Proxied the request" breakdown by method:

  ┌────────────────────────────────────────┬────────────────┬───────┐
  │                 Method                 │ Count (of 500) │   %   │
  ├────────────────────────────────────────┼────────────────┼───────┤
  │ eth_sendBundle                         │ 323            │ 64.6% │
  ├────────────────────────────────────────┼────────────────┼───────┤
  │ engine_newPayloadV4                    │ 106            │ 21.2% │
  ├────────────────────────────────────────┼────────────────┼───────┤
  │ eth_sendRawTransaction                 │ 31             │ 6.2%  │
  ├────────────────────────────────────────┼────────────────┼───────┤
  │ engine_forkchoiceUpdatedV3             │ 18             │ 3.6%  │
  ├────────────────────────────────────────┼────────────────┼───────┤
  │ engine_forkchoiceUpdatedV3_withPayload │ 16             │ 3.2%  │
  ├────────────────────────────────────────┼────────────────┼───────┤
  │ engine_getPayloadV4                    │ 6              │ 1.2%  │
  └────────────────────────────────────────┴────────────────┴───────┘

The changes in this PR target the top 3 producers.

[KA-ROM]

@claude review

EDIT: :(