Trait enrichment results should be processed in evaluations

[adamklie]

To generate a PheWAS plot, we need to run https://github.com/EngreitzLab/gene_network_evaluation/blob/main/src/plotting/plot_gwas_enrichment.py#L10.

To avoid extra computation in the dashboard, we should just automatically compute this during evaluation and save it to a separate file trait_enrichment_processed.txt

[adamklie]

This has now been implemented. I'm going to remove the trait_enrichment_processed.txt file and only output trait_enrichment.txt to avoid confusion.