Frontend: Add Duo Code Review metrics to User metrics table

Proposal

The user metrics table is being introduced in Frontend: User metrics table - first iteration (#574420 - closed) • Ezekiel Kigbo • 18.7 with data available at the time of creating this issue.

codeReviewRequestedCount, codeReviewReactThumbsUpCount and codeReviewReactThumbsDownCount are being exposed via https://gitlab.com/gitlab-org/gitlab/-/issues/570986+s.

We need to add the codeReviewRequestedCount (Duo Code reviews requested) metric to the user metrics table as soon as it becomes available.

We also need to add Duo Code review comments reacted to which is a combination of codeReviewReactThumbsUpCount and codeReviewReactThumbsDownCount.

Implementation

• Extend data source
• Update table visualization
• Update documentation