[MAINTAIN] Multiple extra specs

[AsadJeewa]

Please describe what needs to be maintained?

extras_specs is emebeded in builder.store.ma_environment_spec but there also exists a separate builder.store.extras_spec.extra specs

Describe the outcome you'd like

remove redundant store variables either by only using the embedded ma_environmentspec or separate extras_specs completely

How do we know when maintenance is complete?

Checklist:

• [ ] PR merged in jax-systems