Merge branch 'himkp-retina-width' into 'master'

Set height: auto only on images with both dimension set

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/154316



Merged-by: Lukas 'ai-pi' Eipert <leipert@gitlab.com>
Approved-by: Lukas 'ai-pi' Eipert <leipert@gitlab.com>
Co-authored-by: Himanshu Kapoor <hkapoor@gitlab.com>