Frontend: Add Duo Code Review usage over time metrics to Duo data table

Proposal

Let's add the following to the Duo Metrics table on the GitLab Duo and SDLC trends dashboard:

• Total Duo reviews over time (reviewByAuthorCount + reviewByNonAuthorCount)
• Total Duo review comments over time (postCommentCount)

These data points are being introduced via Backend: Expose IDE metadata for code suggestio... (#570988)

Implementation

• Create data source
• Add Total Duo reviews over time (reviewByAuthorCount + reviewByNonAuthorCount) to the data table
• Add Total Duo review comments over time (postCommentCount) to the data table
• Update documentation