Test that country packages don't have formulas with entity mismatches

[MaxGhenis]

We've had several undetected crashes arising from formulas that mix up entity types, resulting in this type of error:

ValueError: operands could not be broadcast together with shapes (100000,) (279932,)

For example, PolicyEngine/policyengine-us#3298

Let's test for this centrally.

@martinholmer could you share the command you executed in that issue to throw the error?

[martinholmer]

@MaxGhenis asked:

could you share the command you executed in that issue to throw the error?

sim.calculate("hi_income_tax")

where the sim object had been initialized with 100,000 tax units containing 279,932 people.

[MaxGhenis]

Thanks - I would have thought the normal microsim tests would have caught that, since hi_income_tax is in the net income tree. But safer could be computing every variable in a microsim, not only net income.

[nikhilwoodruff]

Yes- we have a test for the UK package that does this and checks for NaNs, should generalise