Code Insights [Charts]: Extend insight categorical-like chart with bar chart

Created by: vovakulikov

Blocked by https://github.com/sourcegraph/sourcegraph/issues/32940

At the moment we have only one chart representation for categorical-like datasets - our pie chart. After this PR about adding a bar chart, we're able to represent categorical data for the lang stats insight with the bar chart.

Lang stats with pie chart	Lang stats with bar chart