[Feature][Process definition] add search function to `select` in batch operation `dialog`. (#6915)

dolphinscheduler-ui/src/js/conf/home/pages/projects/pages/definition/pages/list/_source/relatedItems.vue

@@ -26,7 +26,7 @@
         <m-list-box-f>
           <template slot="name"><strong>*</strong>{{$t('Project Name')}}</template>
           <template slot="content">
-            <el-select v-model="selected" size="small">
+            <el-select v-model="selected" filterable size="small">
               <el-option
                       v-for="item in itemList"
                       :key="item.code"