Use breast cancer test dataset in storybook

[dvchristianbors]

In PR #331 we introduced a new, more representative, test dataset. We should use this dataset in all stories to have more representative test cases of what the vis should look like.

• Fix violin plot stories

Please also add some edge cases to the dataset:

• null values in different combinations
• number columns as string ("2", "10" ...) --> caused some issues in ordino with chromosome column
• duplicates
• .....