twas output data update and twas pipeline workflow update

[Chunmingl]

Changes implemented:

• we add susie_weights_intermediate objects to the twas weights results, to be used for twas and ctwas pipeline
• we do not select top variants at twas pipeline and instead we export top model weights as export_twas_weights_db that includes all variants.
• we use raw r2 to select the best model, instead of previous adjusted rsq, this also applies to the final twas table result output that we output rsq instead of adjusted rsq.

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