Sweep: charts.py should use cutoff_date instead (✓ Sandbox Passed)

[ifost-autodev[bot]]

Description

This pull request updates the charts.py script to use cutoff_date instead of validation_start_time for plotting charts. This change ensures consistency in the x-axis labeling across all generated plots.

Summary

• Updated the plot_and_save function in charts.py:
  • Changed the x-axis data from validation_start_time to cutoff_date.
  • Updated the x-axis label from 'Validation Start Time' to 'Cutoff Date'.
  • Modified the plot title to reflect the change in x-axis labeling.
• No changes were made to the image files: average_depth_vs_time.png, average_in_region_hits_vs_time.png, model_node_count_vs_time.png, and total_loss_vs_time.png.

Fixes #13.

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Rollback Files For Sweep

• [ ] Rollback changes to charts.py

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• [ ] Apply: Add type definitions to python functions if they don't have them