Remove allow list for script-based datasets
https://github.com/huggingface/dataset-viewer/blob/5c5be128c205ae5c1f55440178497db564d81868/chart/values.yaml#L83-L86

Then remove the code that allow script-based datasets in this repo + exception `DatasetModuleNotInstalledError`. Related to #2478.


Remove allow list for script-based datasets: https://github.com/huggingface/dataset-viewer/blob/5c5be128c205ae5c1f55440178497db564d81868/chart/values.yaml#L83-L86

Then remove the code that allow script-based datasets in this repo + exception `DatasetModuleNotInstalledError`. Related to #2478.

