`_static_attr` that is stored in `_constants` throw tracer conversion error

[YigitElma]

Another reason to remove constants. If an attribute is set in _static_attr but passed inside constants and used from there as constants['static'], it throws a TracerConversion error during evaluation. For example,

eq = get("precise_QA")
obj = ObjectiveFunction(QuasisymmetryBoozer(eq=eq, surf_batch_size=1))
obj.build()
obj.compute_scaled_error(obj.x(eq))

TracerBoolConversionError: Attempted boolean conversion of traced array with shape bool[].
The error occurred while tracing the function compute_scaled_error at 
/CODES/DESC/desc/objectives/objective_funs.py:1444 for jit. This concrete value was not 
available in Python because it depends on the value of the argument 
self[0]['_constants']['surf_batch_size'].

I think fixing QuasisymmetryBoozer is enough for this issue, but I still wanted to document this problem in general.

[dpanici]

Oops, that is on me