Consider removing stacked column chart in favor of a more flexible column chart

The following discussion from gitlab-org/gitlab-ui!1781 (merged) should be addressed:

  • @fguibert started a discussion: (+3 comments)

    I played around adding another bar and I was wondering if it was expected that they stack, I'm guessing this is where it happens? Can we have more than 2 columns at the base level without them stacking? This behaviour seems similar to stacked_column component. We can switch between between columnOptions tiled and stacked in stacked_column with presentation prop but not in this component (as far as I can tell, correct me if I'm wrong). Any reason why?

    Screenshot_from_2020-10-14_15-20-00