Display more columns in Merge Request Analytics data table [FE]

Problem to solve

Some desirable columns were not added in the Merge Request Analytics data table MVC because they "need extra queries (preloading) since they are not aggregated ... if we want to be able to sort by these columns, we'll need to think about storing the counts somewhere." (source)

Proposal

In the Merge Request Analytics data table, add the following columns:

• Comments (Needs a preloader query)
• Commits (Needs to be exposed from MR metrics)
• Approvals (Needs a preloader query) - being handled in #251079 (closed)

This page may contain information related to upcoming products, features and functionality. It is important to note that the information presented is for informational purposes only, so please do not rely on the information for purchasing or planning purposes. Just like with all projects, the items mentioned on the page are subject to change or delay, and the development, release, and timing of any products, features, or functionality remain at the sole discretion of GitLab Inc.