Can't create workflow with list iteration in DO_WHILE

**Describe the bug**

**Details**
Conductor version: 3.22.0
Persistence implementation: Postgres
Queue implementation: Postgres
Lock: Redis or Zookeeper? NO
Workflow definition:
```json
{
"name": "test",
"description": "Edit or extend this sample workflow. Set the workflow name to get started",
"version": 1,
"tasks": [
{
"name": "process_items",
"taskReferenceName": "process_items_ref",
"type": "DO_WHILE",
"items": "${workflow.input.itemList}",
"inputParameters": {},
"loopOver": [
{
"name": "http",
"taskReferenceName": "http_ref",
"inputParameters": {
"http_request": {
"uri": "https://api.example.com/process",
"method": "POST",
"body": {
"item": "${process_items_ref.output.loopItem}",
"index": "${process_items_ref.output.loopIndex}"
}
}
},
"type": "HTTP"
}
]
}
],
"inputParameters": [],
"outputParameters": {
"data": "${call_remote_api.output.response.body.data}",
"source": "${call_remote_api.output.response.body.source}"
},
"schemaVersion": 2,
"restartable": true,
"workflowStatusListenerEnabled": false,
"ownerEmail": "example@email.com",
"timeoutPolicy": "ALERT_ONLY",
"timeoutSeconds": 0
}
```

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'Definitions'
2. Click on 'Create workflow definition'
3. Put workflow definiton
4. Click save
5. See error

**Expected behavior**
That it can be created

**Additional context**
I think the WorkflowTaskValidator needs to be updated, as it does not reflect these changes.