Additions and deletions not present in REST API for merge request diff stats

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Summary

The Merge Request Diff REST API does not contain the count of lines added, deleted and changes in the respone but the Merge Request GraphQL API does have a field diffStatsSummary which shows total lines added, deleted and changed as part of the merge request

Steps to reproduce

1. Make a GET request on the REST API /projects/:id/merge_requests/:merge_request_iid/diffs and observe that the individual changes are listed but a summary of the changes is not present

2. Use the GraphiQL Explorer and use the below query and observe that the diff summary is listed

{
  project(fullPath: "gitlab-org/gitlab") {
    mergeRequest(iid: "154530") {
      diffStatsSummary {
        additions
        deletions
        changes
      }
    }
  }
}

Example Project

https://gitlab.com/gitlab-org/gitlab

What is the current bug behavior?

The summary of diff is not present in REST API

What is the expected correct behavior?

The summary of diff should also be present in REST API

Relevant logs and/or screenshots