Performance should be dependent on infected persons

[xsaschako]

Motivation / Current Behaviour

Currently it doesnt make a huge difference, if a lot of people are infectious for the runtime. But it should, as we do alot of unneccessary work.

Enhancement description

We need to just do it for a cell/location with a transmission risk. Currently we do this for every location.

Additional context

No response

Checklist

• [X] Attached labels, especially loc:: or model:: labels.
• [X] Linked to project

[xsaschako]

On paper branch: when caching exposure rate flag location as infecitous. On main: probablysame

[xsaschako]

first tests on main show a 20% performance gain