Merge #14097: validation: Log FormatStateMessage on ConnectBlock error in ConnectTip

fa309dc305 validation: Log FormatStateMessage on ConnectBlock error in ConnectTip (MarcoFalke)

Pull request description:

  This change additionally logs the validation state on error, which is not logged at all on current master.

  Before:
  ```
  ERROR: ConnectTip(): ConnectBlock ffffff.... failed
  ```

  After:
  ```
  ERROR: ConnectTip: ConnectBlock ffffff.... failed, bad-cb-amount (code 16)
  ```

Tree-SHA512: e69ee0266772b3f77c0193c4a959c2444bf1a51259bd29d790cf665582b037997e520c8567f70b36362c071dcfe1a8ebd7c0f2286cf1b842df5731960e7e1ba0

src/validation.cpp

@@ -2448,7 +2448,7 @@ bool CChainState::ConnectTip(CValidationState& state, const CChainParams& chainp
         if (!rv) {
             if (state.IsInvalid())
                 InvalidBlockFound(pindexNew, state);
-            return error("ConnectTip(): ConnectBlock %s failed", pindexNew->GetBlockHash().ToString());
+            return error("%s: ConnectBlock %s failed, %s", __func__, pindexNew->GetBlockHash().ToString(), FormatStateMessage(state));
         }
         nTime3 = GetTimeMicros(); nTimeConnectTotal += nTime3 - nTime2;
         LogPrint(BCLog::BENCH, "  - Connect total: %.2fms [%.2fs (%.2fms/blk)]\n", (nTime3 - nTime2) * MILLI, nTimeConnectTotal * MICRO, nTimeConnectTotal * MILLI / nBlocksTotal);