non serializable config fields for RE
non serializable config fields for RE

Summary: non serializable config field for RE (according to: https://docs.google.com/document/d/1gJDigvC9WSJd-58eSsKdpJ1Zkk0sX_lRlAyxpeAmgdI/edit) , we remove them from buck config before uploading to CAS

Reviewed By: Skory

fbshipit-source-id: dc13b361f20ecb8120003321c79910d8485d04af

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