Suggested improvement: Consider adding high level overview of MR size on the `Overview` tab
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### Insight
Multiple users mentioned that they would like to know right away how big a merge request is. The counter on the `Changes` tab is useful but not very detailed. A file could have one changed file but hundreds of changed lines.
### Supporting evidence
[Dovetail insight](https://dovetailapp.com/projects/ef522421-7e82-4b54-9712-9f2c51465cdf/insights/present/046837ef-f37f-42ef-a78f-0b2e1f29b7d5)
### Action
Consider adding the `+25 -54` overview on the main Overview tab, or maybe persist it somewhere in the top section.
### Resources
- :dove: [Dovetail project](https://dovetailapp.com/projects/ef522421-7e82-4b54-9712-9f2c51465cdf/readme)
- :mag: [Research issue](https://gitlab.com/gitlab-org/ux-research/-/issues/1362)
issue