This is a follow-up on: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/67050

Initial rendering performance optimization using content-visiblity introduced issues onto Blame page scrolling.
This is a fix for those issues, which uses content-visibility only for the elements with a known height.

Changelog: other
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/73173