[FEAT MERGE] Merge syslog user experience improvement to master

Co-authored-by: Charles0429 <xiezhenjiang@gmail.com>
Co-authored-by: tino247 <tino247@126.com>
Co-authored-by: chaser-ch <chaser.ch@antgroup.com>

deps/oblib/unittest/lib/test_work_queue.cpp

@@ -88,6 +88,7 @@ public:
   }
   virtual ObAsyncTask *deep_copy(char *buf, const int64_t buf_size) const override
   {
+    int ret = 0;
     ObAsyncTask *task = NULL;
     if (buf == NULL || buf_size < sizeof(*this)) {
       OB_LOG(ERROR, "invalid argument");