message: log: Remove unnecessary timing logs for Callbacks bench
  Logging of Callbacks are no longer needed and records events that are not relevant for performance analysis.
diff: @@ -1498,7 +1498,6 @@ static int64_t nTimeForks = 0;
  static int64_t nTimeVerify = 0;
  static int64_t nTimeConnect = 0;
  static int64_t nTimeIndex = 0;
  -static int64_t nTimeCallbacks = 0;
  static int64_t nTimeTotal = 0;
  static int64_t nBlocksTotal = 0;
  @@ -1889,9 +1888,6 @@ bool CChainState::ConnectBlock(const CBlock& block, BlockValidationState& state,
  int64_t nTime5 = GetTimeMicros(); nTimeIndex += nTime5 - nTime4;
  LogPrint(BCLog::BENCH, " - Index writing: %.2fms [%.2fs (%.2fms/blk)]\n", MILLI * (nTime5 - nTime4), nTimeIndex * MICRO, nTimeIndex * MILLI / nBlocksTotal);
  - int64_t nTime6 = GetTimeMicros(); nTimeCallbacks += nTime6 - nTime5;
  - LogPrint(BCLog::BENCH, " - Callbacks: %.2fms [%.2fs (%.2fms/blk)]\n", MILLI * (nTime6 - nTime5), nTimeCallbacks * MICRO, nTimeCallbacks * MILLI / nBlocksTotal);
  -
  TRACE7(validation, block_connected,
  block.GetHash().ToString().c_str(),
  pindex->nHeight,
  