Merge bitcoin/bitcoin#23907: tracing: utxocache tracepoints follow up for #22902

799968e8b3 tracing: misc follow-ups to 22902 (0xb10c)
36a6584703 tracing: correctly scope utxocache:flush tracepoint (Arnab Sen)

Pull request description:

  This PR is a follow-up to the [#22902](https://github.com/bitcoin/bitcoin/pull/22902).

  Previously, the tracepoint `utxocache:flush` was called, even when it was not flushing. So, the tracepoint is now scoped to write only when coins cache to disk.

ACKs for top commit:
  0xB10C:
    ACK 799968e8b3

Tree-SHA512: ebb096cbf991c551c81e4339821f10d9768c14cf3d8cb14d0ad851acff5980962228a1c746914c6aba3bdb27e8be53b33349c41efe8bab5542f639916e437b5f

src/validation.cpp

@@ -2373,14 +2373,13 @@ bool CChainState::FlushStateToDisk(
                 return AbortNode(state, "Failed to write to coin database");
             nLastFlush = nNow;
             full_flush_completed = true;
+            TRACE5(utxocache, flush,
+                   (int64_t)(GetTimeMicros() - nNow.count()), // in microseconds (µs)
+                   (u_int32_t)mode,
+                   (u_int64_t)coins_count,
+                   (u_int64_t)coins_mem_usage,
+                   (bool)fFlushForPrune);
         }
-        TRACE6(utxocache, flush,
-               (int64_t)(GetTimeMicros() - nNow.count()), // in microseconds (µs)
-               (u_int32_t)mode,
-               (u_int64_t)coins_count,
-               (u_int64_t)coins_mem_usage,
-               (bool)fFlushForPrune,
-               (bool)fDoFullFlush);
     }
     if (full_flush_completed) {
         // Update best block in wallet (so we can detect restored wallets).