Add 'type' field to ExperimentParametersModel

This commit introduces a new 'type' field in the ExperimentParametersModel schema and updates the associated code in `sample.py` to include this field during object creation. Additionally, unnecessary lines and redundant code in `testfunctions.ipynb` have been removed for better readability and maintainability.

backend/app/schemas.py

@@ -906,6 +906,7 @@ class Datasets(BaseModel):
 
 class ExperimentParametersBase(BaseModel):
     run_number: int
+    type: str
     beamline_parameters: Optional[BeamlineParameters] = None
     dataset: Optional[Datasets] = None
     sample_id: int