Issue Summary

The commit activity in the PR activity feed doesn't align with the commits list on the PR.

This is reproducible on Data Center: (yes) / (no) no

Steps to Reproduce

1. Create a pull request
2. While the pull request is open, clone the PR source branch repository
3. add local commits (for example in the order of x, y, z commits. z being the latest)
4. push the changes to the remote repository. x, y, z commits will be pushed to the remote repository in a batch and will be shown on the commits page and in the PR commits list.

Expected Results

The PR activity feed should show UPDATED: the pull request with 3 commits: x, y, z

Actual Results

The PR activity feed showing UPDATED: the pull request with 1 commit: z

Workaround

We need to refer to the commits list in the PR instead of the PR activity feed, to view the local commits pushed to the remote in a batch.