Incorrect values when saving and loading json files for off-design

Description

Currently we save the results of a sizing run to a json file using aviary_inputs for the names and values of the data. This is a problem since these values are stored as an option at the time the problem is instantiated and do not get updated after the optimization is finished.
Additionally, there are many unnecessary values being dumped into the json file that are not relevant to the problem at hand (eg: blended wing variables for a non-blended wing aircraft)

Example

In save_sizing_to_json() in methods_for_level2.py, the lines
for data in self.aviary_inputs:
(name, (value, units)) = data
type_value = type(value)

are the source of the issue, changing them to
for data in self.aviary_inputs:
(name, (_, units)) = data
try:
value = self.get_val(name, units=units)
except KeyError:
(_, (value, _)) = data

Appears to solve the issue but is a hacky-fix that doesn't address the issue of bloat

Aviary Version

0.9.4-dev

Relevant environment information

No response