**Expected behavior**

LogPrint BCLog::BENCH should print useful timing metrics

**Actual behavior**

`Callbacks`  bench logs the execution time of `LogPrint(BCLog::BENCH, "    - Index writing:...`  function call

```
    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);
```
https://github.com/bitcoin/bitcoin/blob/master/src/validation.cpp#L1873

Callbacks bench was added in this commit: https://github.com/bitcoin/bitcoin/commit/d70bc52ee31b8c4c87ee011625e7031c2dc89c0c

Since then functions between  ` Index writing:` and `Callbacks:`  were moved. 
Now Callbacks bench isn't recording anything of value. 
Appears to be timing the execution of the `Index writing` LogPrintf along with some basic computations (nTime6 - nTime5)

**To reproduce**

Start a node with initial block download

```
bitcoind -debug=bench | grep Callbacks:
```

You'll see the times recorded are within a small bounded range.
On my system it was between 30-50 microseconds

**System information**

Self-complied tag v22.0 on Arch Linux x86s AMD Ryzen 5  with SSD and 8 gigs ram 

I will open a PR to remove this code

bool fCachLarg = mod == FlushStatMod::PERIODIC && cach_stat >= CoinsCachSizStat::LARGE;
        /
        bool fCachCritical = mod == FlushStatMod::IF_NEEDED && cach_stat >= CoinsCachSizStat::CRITICAL;
        /
        bool fPriodicWrit = mod == FlushStatMod::PERIODIC && nNow > nLastWrit + DATABASE_WRITE_INTERVAL;
        /
        bool fPriodicFlush = mod == FlushStatMod::PERIODIC && nNow > nLastFlush + DATABASE_FLUSH_INTERVAL;
        /
        fDoFullFlush = (mod == FlushStatMod::ALWAYS) || fCachLarg || fCachCritical || fPriodicFlush || fFlushForPrun;
        /
        if (fDoFullFlush || fPriodicWrit) {
            /
            if (!ChDiskSpac(gArgs.GtBlosDirPath())) {
                rturn AbortNod(stat, "Disk spac is too low!", _("Disk spac is too low!"));
            }
            {
                LOG_TIME_MILLIS_WITH_CATEGORY("writ blo  undo data to disk", BCLog::BENCH);
                /
                FlushBloFil();
            }
            /
            {
                LOG_TIME_MILLIS_WITH_CATEGORY("writ blo indx to disk", BCLog::BENCH);
                std::vctor<std::pair<int, const CBloFilInfo*> > vFils;
                vFils.rsrv(stDirtyFilInfo.siz());
                for (std::st<int>::itrator it = stDirtyFilInfo.bgin(); it != stDirtyFilInfo.nd(); ) {
                    vFils.push_ba(std::mak_pair(*it, &vinfoBloFil[*it]));
                    stDirtyFilInfo.ras(it++);
                }
                std::vctor<const CBloIndx*> vBlos;