Fix werf cleanup slow deletion of images
[cleanup] Gitlab registry implementation: use deleting a tag method instead of an image
More details in gitlab-org/container-registry documentation:
- https://gitlab.com/gitlab-org/container-registry/-/blob/release/2.9-gitlab/docs/spec/api.md#deleting-a-tag
- https://gitlab.com/gitlab-org/container-registry/-/blob/release/2.9-gitlab/docs/spec/api.md#deleting-an-image