fix(接口定义): 修复单接口用例删除后再次添加用例需要选环境的缺陷；修复xmind下载模版之后直接导入报错的缺陷

--bug=1004993 --user=宋天阳 【测试用例】导入xmind用例报错
https://www.tapd.cn/55049933/s/1024975  --bug=1004963 --user=宋天阳
单接口用例删除后，再次添加用例执行提示选择环境 https://www.tapd.cn/55049933/s/1024976

frontend/src/business/components/api/definition/components/case/ApiCaseHeader.vue

@@ -50,7 +50,7 @@
               :project-id="projectId"
               :is-read-only="isReadOnly"
               :useEnvironment='useEnvironment'
-              @setEnvironment="setEnvironment"/>
+              @setEnvironment="setEnvironment" ref="environmentSelect"/>
           </div>
         </el-col>
         <el-col :span="1" v-if="!(isReadOnly || isCaseEdit)">
@@ -106,6 +106,9 @@
       },
     },
     methods: {
+      refreshEnvironment(){
+        this.$refs.environmentSelect.refreshEnvironment();
+      },
       setEnvironment(data) {
         this.$emit('setEnvironment', data.id);
       },
@@ -124,6 +127,7 @@
       },
       addCase() {
         this.$emit('addCase');
+        this.refreshEnvironment();
       },
       getColor(enable, method) {
         if (enable) {

frontend/src/business/components/api/definition/components/case/MsEnvironmentSelect.vue

@@ -54,6 +54,9 @@
         }
       },
       methods: {
+        refreshEnvironment(){
+          this.$emit('setEnvironment', this.environment);
+        },
         getEnvironments() {
           if (this.projectId) {
             this.$get('/api/environment/list/' + this.projectId, response => {