Resolve avatar size in commit item

What does this MR do and why?

This updates the avatar size for the commit item component. This is part of the UserAvatarList migration to GlAvatar &7767 (closed).

I followed this MR for reference > https://gitlab.com/gitlab-org/gitlab/-/merge_requests/83837

Screenshots or screen recordings

Before

feature flag disabled feature flag enabled
image image

After (this MR)

feature flag enabled

Note: follow-up issue 👣

You may notice the spacing is a bit off here with the change. I want to keep the changes in this MR small and focused on the migration without introducing additional changes. I will resolve this iteratively in a follow up issue > #357907 (closed) 😀

How to set up and validate locally

  1. Enable the feature flag by running: echo "Feature.enable(:gl_avatar_for_all_user_avatars)" | rails c
  2. Go to Merge requests > select a merge request with commits > click on the "Commits" tab
  3. Click on the "Add previously merged commits" button
  4. The avatar will appear similar to the expected screenshot

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #355857 (closed)

Edited by Samantha Ming

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