Registration of vector validity masks
In VS 1 registrar, masks were registered by referencing a xpath searching for the vector mask in the GSC schema and registered along the product: https://gitlab.eox.at/esa/prism/vs/-/blob/staging/core/registrar/backend.py#L254
VS 2 registration of stac items if I am not mistaken does not have such concept of registering vector masks yet implemented.
This should be the only feature missing to deploy vhr18 collection https://gitlab.eox.at/esa/prism/configs/-/issues/38 with the new vs 2 configs, but IS NOT URGENT at all.