[Election] fix election priority memory leak

src/logservice/leader_coordinator/election_priority_impl/election_priority_impl.h

@@ -132,9 +132,9 @@ private:
   bool is_observer_stopped_;// kill -15
   bool is_server_stopped_;
   bool is_zone_stopped_;
-  common::ObSArray<FailureEvent> fatal_failures_;// negative infos
+  common::ObSEArray<FailureEvent, 3> fatal_failures_;// negative infos
   bool is_primary_region_;
-  common::ObSArray<FailureEvent> serious_failures_;// negative infos
+  common::ObSEArray<FailureEvent, 3> serious_failures_;// negative infos
   share::SCN scn_;
   bool is_in_blacklist_;
   common::ObStringHolder in_blacklist_reason_;

src/logservice/palf/election/algorithm/election_impl.h

@@ -239,6 +239,8 @@ private:// 定向暴露给友元类
               }
               LOG_PHASE(TRACE, phase, "compare priority done");
             }
+            lhs_priority->~ElectionPriority();
+            rhs_priority->~ElectionPriority();
           }
         }
       }