Data Import Error

**Describe the bug**
We get an incorrect formatting error when attempting to import new data.
```
Validation error
Error at item 0: "llm.inputs.retrieved_context" key is expected in task data [assume: item["data"] = task root with values] :: {'data': {'observability.identifiers.user': [{'key': 'session_id', 'value': ''}], 'observability.identifiers.system': [{'key': 'correlation_id', 'value': ''}, {'key': 'trace_id', 'value': ''}, {'key': 'parent_span_id', 'value': ''}], 'observability.identifiers.llm': [{'key': 'interaction_id', 'value': ''}, {'key': 'runnable_sequence_id', 'value': ''}, {'key': 'runnable_sequence_step', 'value': ''}, {'key': 'runnable_id', 'value': ''}], 'llm.inputs.retrieved_context': [{'id': '1', 'title': '', 'body': ''}, {'id': '2', 'title': '', 'body': ''}], 'llm.outputs': [{'key': 'text_response', 'value': ''}]}, 'file_upload_id': 28}
```

I believe this error is telling me that the key `llm.inputs.retrieved_context` defined in my interface is not present in the data being uploaded, however it is there.

If we import a data file, then add the interface it works fine, but if the interface is already existing we get the error message.

**To Reproduce**

Example Interface:
```

.lsf-select { display: none; }

LLM Outputs:

```
example data:
[fa-test.json](https://github.com/user-attachments/files/17309047/fa-test.json)

Steps to reproduce the behavior:
1. Create a new project
2. Add Label Interface
3. Try to Import the data file

**Expected behavior**
Data file is uploaded and rendered through the interface

**Screenshots**
With data input directly into the labeling interface configuration:

When data is uploaded prior to setting up the labeling interface:

When attempting to import data as a file after labeling interface is saved:

**Environment (please complete the following information):**
- OS: Mac OS Sonoma 14.5
- Label Studio Version [e.g. 1.13.1]

**Additional context**
The same example data works if input as data in the labeling interface preview
The same example data also renders correctly in the UI if you:
1. Create a new project
2. Upload the example data file FIRST
3. Create the labeling interface