refactor(性能测试): 下拉列表组件中增加输入筛选功能

frontend/src/business/components/performance/test/EditPerformanceTestPlan.vue

@@ -9,7 +9,7 @@
                       maxlength="30" show-word-limit
             >
               <template v-slot:prepend>
-                <el-select :disabled="isReadOnly" v-model="testPlan.projectId"
+                <el-select filterable v-model="testPlan.projectId"
                            :placeholder="$t('load_test.select_project')">
                   <el-option
                     v-for="item in projects"