fix(测试跟踪)：去除ECharts组件依赖关系图名称后面默认字符

--bug=1025878 --user=王旭 【测试跟踪】依赖关系名称后面存在-，建议去除或增加对应的value https://www.tapd.cn/55049933/s/1368565

framework/sdk-parent/frontend/src/components/graph/RelationshipGraph.vue

@@ -166,6 +166,7 @@ export default {
         }
         x += 1;
         y += 1;
+        item.value = "\0"
       });
       this.visible = false;
       this.$nextTick(() => {