fix mongodb upload alert visibility (#12545)

#### What this PR does / why we need it?

#### Summary of your change

#### Please indicate you've done the following:

- [ ] Made sure tests are passing and test coverage is added if needed.
- [ ] Made sure commit message follow the rule of [Conventional Commits specification](https://www.conventionalcommits.org/).
- [ ] Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

frontend/src/components/upload/index.vue

@@ -9,7 +9,7 @@
         >
             <template #content>
                 <div v-loading="loading">
-                    <div>
+                    <div v-if="type !== 'mongodb'">
                         <el-alert :closable="false" type="warning">
                             <template #default>
                                 <ul>