Merge pull request #8764 from taosdata/fix/TD-11248

[TD-11248]<fix>: unify schemaless timestamp column name

src/client/src/tscParseLineProtocol.c

@@ -1840,7 +1840,7 @@ static int32_t parseSmlTimeStamp(TAOS_SML_KV **pTS, const char **index, SSmlLine
   const char *start, *cur;
   int32_t ret = TSDB_CODE_SUCCESS;
   int len = 0;
-  char key[] = "_ts";
+  char key[] = "ts";
   char *value = NULL;
 
   start = cur = *index;