server: Various feerate improvements

Steven Rooserequested to merge
fee-rate-log into master

Summary by CodeRabbit

  • Bug Fixes

    • Fixed fee rate ceiling application and prevented double updates during fallback scenarios.
    • Corrected fee rate clamping logic for proper constraint handling.

  • Improvements

    • Updated fee estimation strategy for enhanced accuracy.
    • Refined fee rate caching and telemetry logging to better reflect actual rate changes.
Edited by coderabbit

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