fix(系统设置): 修复复制环境，切换项目http请求头丢失的缺陷

--bug=1018884 --user=王孝刚
【系统设置】github#18884，工作空间下环境管理复制环境-复制时选择另一个项目，导致复制后的环境HTTP请求头丢失
https://www.tapd.cn/55049933/s/1277542

frontend/src/business/components/project/menu/EnvironmentList.vue

@@ -285,6 +285,7 @@ export default {
     },
 
     copyEnv(environment) {
+      this.ifCreate = true;
       this.currentProjectId = environment.projectId;  //复制时默认选择所要复制环境对应的项目
       this.dialogTitle = this.$t('api_test.environment.copy_environment');
       const temEnv = {};

frontend/src/business/components/settings/workspace/environment/EnvironmentList.vue

@@ -74,7 +74,7 @@
         <el-col :span="20">
           <el-form label-width="80px" :rules="rules" style="display: flow-root">
             <el-form-item class="project-item" prop="currentProjectId" :label="$t('project.select')">
-              <el-select @change="handleProjectChange" v-model="currentProjectId" filterable clearable>
+              <el-select v-model="currentProjectId" filterable clearable :disabled="!ifCreate">
                 <el-option v-for="item in projectList" :key="item.id" :label="item.name" :value="item.id"></el-option>
               </el-select>
             </el-form-item>
@@ -415,9 +415,6 @@ export default {
       downloadFile('MS_' + envs.length + '_Environments.json', JSON.stringify(envs));
     },
 
-    handleProjectChange() {   //项目选择下拉框选择其他项目后清空“启用条件”,因为项目变了模块也就变了。
-      this.currentEnvironment.config.httpConfig.conditions = [];
-    },
     parseDomainName(environment) {   //解析出环境域名用于前端展示
       if (environment.config) {
         const config = JSON.parse(environment.config);