Changed the damage outputs

[micheles]

Warning: this PR is expected to BREAK:

• the headers of the damage outputs, i.e. the action check_all_outputs
• the /extract/agg_damages/<loss_type> REST API, i.e. the QGIS plugin

This change is crucial for implementing #9746.
NB: classical_damage/case_master uses now total_losses = structural+nonstructural.
NB: the numbers in case_7 are correct being total_losses = structural+nonstructural+contents.
NB: specifying total_losses is now mandatory in damage calculations with multiple loss types

[raoanirudh]

What's the main change being introduced in this PR?

[micheles]

The headers, as written above. For instance

asset_id,taxonomy,lon,lat,structural~no_damage,structural~slight,structural~moderate,structural~extensive,structural~complete
-> asset_id,taxonomy,lon,lat,no_damage,slight,moderate,extensive,complete

Or there is a single loss type (therefore no need to specify it) or total_losses must be specified so the damage outputs correspond to that.

[micheles]

Notice that no functionality is lost, in the worst case you can run multiple calculations (i.e. set total_losses=structural, then total_losses=nonstructural, then total_losses=contents). It can be annoying for the users but the simplification allows me to progress with #9746, so I need it right now.