Remove staging arm64v8/* images
The clean images
job is missing some arm64v8 images from the list, that are defined at https://salsa.debian.org/salsa-ci-team/pipeline/-/blob/9d3d8d6b63d61680d6da5d0ce83a1f9dd375cb2c/.images-debian.yml#L169.
This makes that MRs that have building those images enabled, don't clean them once the pipeline finishes.