Merge Damage views of different states into one

The issue describes the changes that need to be made in the creation of damage view. The function create_damage_view is defined in exposure-lib. this issue is a sub-issue of https://git.gfz-potsdam.de/dynamicexposure/globaldynamicexposure/loss-calculator/-/issues/93

In MR connected to this issue, only the damage view for residual and building entities are modified. Next step would be to apply this merge when the damage view aggregation type is set tile (buildings+residuals)