Polish: Fix games db primary key.

[MattRWallace]

During the training stage the games table primary key has to be set to the gameId. This needs to be fixed in the build stage and then the manual set during training can be removed.

https://github.com/MattRWallace/NHLPredictor/blob/fcdf75edc77f19c4d357d1bee3d9fb8c324597c6/src/nhl_predictor/model/summarizers/average_player_summarizer.py#L289C9-L289C43