fix: handle leak (#20836)

* fix: handle leak

* fix: del unused code

---------
Co-authored-by: Nfacetosea <25808407@qq.com>

source/libs/executor/inc/dataSinkInt.h

@@ -29,7 +29,6 @@ struct SDataSinkHandle;
 
 typedef struct SDataSinkManager {
   SDataSinkMgtCfg cfg;
-  TdThreadMutex   mutex;
 } SDataSinkManager;
 
 typedef int32_t (*FPutDataBlock)(struct SDataSinkHandle* pHandle, const SInputData* pInput, bool* pContinue);

source/libs/executor/src/dataSinkMgt.c

@@ -23,7 +23,6 @@ SDataSinkStat           gDataSinkStat = {0};
 
 int32_t dsDataSinkMgtInit(SDataSinkMgtCfg* cfg) {
   gDataSinkManager.cfg = *cfg;
-  taosThreadMutexInit(&gDataSinkManager.mutex, NULL);
   return 0;  // to avoid compiler eror
 }