refactor(测试跟踪): 缺陷标题长度校验

--bug=1010527 --user=陈建星 【测试计划】-执行用例时添加缺陷-标题长度限制小于64 有点短，建议再长点。 https://www.tapd.cn/55049933/s/1107896

frontend/src/business/components/track/issue/IssueEditDetail.vue

@@ -155,7 +155,7 @@ export default {
       rules: {
         title: [
           {required: true, message: this.$t('commons.please_fill_content'), trigger: 'blur'},
-          {max: 64, message: this.$t('test_track.length_less_than') + '64', trigger: 'blur'}
+          {max: 300, message: this.$t('test_track.length_less_than') + '300', trigger: 'blur'}
         ],
         description: [
           {required: true, message: this.$t('commons.please_fill_content'), trigger: 'blur'},