When the SQL node is selected (#6851)

The data source list needs to scroll continuously, and the search efficiency is low

Add a quick search box to quickly locate the data source to be selected

dolphinscheduler-ui/src/js/conf/home/pages/dag/_source/formModel/tasks/_source/datasource.vue

@@ -33,6 +33,7 @@
                 v-model="datasource"
                 style="width: 288px;"
                 size="small"
+                 filterable
                 :disabled="isDetails">
         <el-option
                 v-for="city in datasourceList"