[tests] Attempt to fix compatibility break from SAI headers (#3321)

Error is show up when we move sai headers from v1.14 to v1.15

sonic-net/sonic-sairedis#1431 (comment)

What I did
Fix tests so they can pass during backward compatibility break

tests/mock_tests/portsorch_ut.cpp

@@ -656,6 +656,7 @@ namespace portsorch_test
             mockReply->element[2] = (redisReply *)calloc(sizeof(redisReply), 1);
             mockReply->element[2]->type = REDIS_REPLY_STRING;
             sai_port_oper_status_notification_t port_oper_status;
+            memset(&port_oper_status, 0, sizeof(port_oper_status));
             port_oper_status.port_state = oper_status;
             port_oper_status.port_id = port.m_port_id;
             std::string data = sai_serialize_port_oper_status_ntf(1, &port_oper_status);

tests/mock_tests/switchorch_ut.cpp

@@ -292,7 +292,9 @@ namespace switchorch_test
         initSwitchOrch();
 
         sai_timespec_t timestamp = {.tv_sec = 1701160447, .tv_nsec = 538710245};
-        sai_switch_health_data_t data = {.data_type = SAI_HEALTH_DATA_TYPE_GENERAL};
+        sai_switch_health_data_t data;
+        memset(&data, 0, sizeof(data));
+        data.data_type = SAI_HEALTH_DATA_TYPE_GENERAL;
         vector<uint8_t> data_from_sai({100, 101, 115, 99, 114, 105, 112, 116, 105, 245, 111, 110, 245, 10, 123, 125, 100, 100});
         sai_u8_list_t description;
         description.list = data_from_sai.data();