Frontend: Duo Code Review comment sentiment

Proposal

Add the Code Review comment sentiment chart from https://gitlab.com/gitlab-org/gitlab/-/issues/570320#duo-code-review-usage-analysis using a tiled BarChart visualization.

The following data is being added via Backend: Duo Code Review namespace-level metric... (#570987)

• postCommentCount
• thumbsUpCount
• thumbsDownCount

Implementation

• Create data source? (assuming after Frontend: Add Duo Code Review usage over time m... (#573979) we can just extend the data source)
• Add visualization template to GitLab Duo and SDLC trends dashboard