Discuss - disabling regular chart types when 2 data sets are merged

[sosiology]

@sosiology @bprusinowski Thanks for this observation. To me this leads back to the discussions of disabling regular chart types when two datasets are merged. My opinion is that it confuses the user if they only see one measure or one dataset even though they added another dataset. We should bring back this discussion when we revise the project again and focus again on the flow for merging cubes.

Originally posted by @KerstinFaye in https://github.com/visualize-admin/visualization-tool/issues/1772#issuecomment-2385165068