tikv: slience a log when async committing (#22555)

Signed-off-by: Shuaipeng Yu <jackysp@gmail.com>

store/tikv/2pc.go

@@ -1298,7 +1298,7 @@ func (c *twoPhaseCommitter) execute(ctx context.Context) (err error) {
 	if c.isAsyncCommit() {
 		// For async commit protocol, the commit is considered success here.
 		c.txn.commitTS = c.commitTS
-		logutil.Logger(ctx).Info("2PC will use async commit protocol to commit this txn",
+		logutil.Logger(ctx).Debug("2PC will use async commit protocol to commit this txn",
 			zap.Uint64("startTS", c.startTS), zap.Uint64("commitTS", c.commitTS),
 			zap.Uint64("connID", c.connID))
 		go func() {