feature_7513 (#7707)

Co-authored-by: SbloodyS <sbloodys@qq.com>

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

@@ -20,7 +20,9 @@
           :disabled="isDetails"
           size="small"
           @change="_onChange"
-          v-model="selectedValue">
+          v-model="selectedValue"
+          filterable
+          allow-create>
       <el-input
               ref="input"
               slot="trigger"