- Renamed `semantic_models` to `models` in YAML template and related structures for consistency.
- Changed `expr` field type in `PostDatasetsEntityRelationshipsRequest` from `Vec<String>` to `String` to simplify data handling.
- Updated `BusterModel` struct to reflect the new `models` naming and removed unused `ModelDefaults` struct.
- Adjusted tests to align with the updated model structure.
These changes enhance clarity and maintainability in the model representation and data handling within the buster-cli.
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