Use both assigned and inferred should show
Use both assigned and inferred should show

We have added assigned_should_show and inferred_show_show to the
database. These columns will be used to store the information on the
human annotated should_show and computed should_show flags, ie training
data and model predictions. We want to use the human predictions
whenever possible. For this change we are using it for the should_show
flag in search export as we coalesce the two columns.

RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline