[BUG] data factory, specs on "dataFlow" does not match live date of "dateflow"

### API Spec link

https://github.com/Azure/azure-rest-api-specs/blob/4e8946e77e12b5f6b96c20a61f519cc8746aea19/specification/datafactory/resource-manager/Microsoft.DataFactory/DataFactory/stable/2018-06-01/entityTypes/Pipeline.json#L8550

### API Spec version

2018-06-01

### Describe the bug

see https://github.com/Azure/azure-sdk-for-java/issues/39402#issuecomment-3673312480 for customer report and dev diagnostic on live data.

### Expected behavior

Spec and live data defines same property.

### Actual behavior

Wrong casing on the property.

### Reproduction Steps

see https://github.com/Azure/azure-sdk-for-java/issues/39402

### Environment

_No response_

Start at specification/datafactory/resource-manager/Microsoft.DataFactory/DataFactory/stable/2018-06-01/entityTypes/Pipeline.json around line 8550. Compare the dataFlow property casing with the live data and diagnostics linked from Azure SDK issue 39402, then update the API specification so the property name matches and validate the spec changes.

Written by the indexing model from the issue text.