Refactor insertSubmission function
Refactor insertSubmission function

Intead of passing in db info obtained from an interface object, pass in
the session that's obtained in the fileTests setupUpClass method.

chambers-brian/SIG_Digital-Strategy_SI_ODP_Backend,chambers-brian/SIG_Digital-Strategy_SI_ODP_Backend,fedspendingtransparency/data-act-broker-backend,fedspendingtransparency/data-act-broker-backend