Debug the Kaizenflow pipeline

[tkpratardan]

There are two issues in this pipeline:

1. Unable to append the preprocessing node to the DAG (file: research_amp/soccer_prediction/kaizenflow_soccer_prediction.ipynb)
   

2. Merging the original dataframe along with the output of the double-poisson model.

• As the output df from the node contains on the only the target variable, we have to find a way to merge the output to the original dataframe.

@sonaalKant @gitpaulsmith @gpsaggese

[gpsaggese]

Probably @gitpaulsmith can see the problem right away.

[tkpratardan]

Resolved in #1082