[Querythrottler]Remove noisy config loading error log (#18904)

Signed-off-by: siddharth16396 <[email protected]>

Author: siddharth16396

go/vt/vttablet/tabletserver/querythrottler/query_throttler.go

@@ -186,7 +186,6 @@ func (qt *QueryThrottler) startConfigRefreshLoop() {
 			case <-configRefreshTicker.C:
 				newCfg, err := qt.cfgLoader.Load(qt.ctx)
 				if err != nil {
-					log.Errorf("Error loading config: %v", err)
 					continue
 				}