Migrate `breadcrumb-class-haml` in `app/views/projects/commits/show.html.haml`

Detected usage of gl-breadcrumb class inside HAML file. Please, check one of the issues - #367326 (closed) or gitlab-org/gitlab-services/design.gitlab.com#1174 to see whether the implementation for conventional or non-navigational breadcrumbs is ready and your instance can be migrated to one of these implementations.