Add new location of gitlab-shell logs

Alejandro Rodríguezrequested to merge
gitlab-shell-location into master

This enables the change on gitlab-org/omnibus-gitlab!3680 (merged). We keep the old location to be able to make this change backwards compatible. We should later delete the old location once it's not receiving logs any more.

Closes https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/8192

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