Blame view - "authored" line leaking into next row

Summary

In the blame view, when a user’s display name is long, it leaks the "authored" line into the next row.

Steps to reproduce

Go to https://gitlab.com/gitlab-org/gitlab-vscode-extension/-/blob/main/README.md?ref_type=heads&plain=1&blame=1

Tasks

• Fix content to support longer user names and avoid breaking layout

Nice to have:

• Improve readability of line content in smaller screens