Address bugs and improve code cleanliness

[ConnectedSystems]

PR addresses bugs, improves code cleanliness, and enhances functionality across multiple modules.

• It fixes issues related to irrigation, costing, and result collation.
• Enhancements focus on more accurate calculations, better handling of edge cases, and improved code readability.

Specifically, it:

• Corrects handling of irrigation efficiency, ensuring accurate water application and reporting.
• Refines pump cost calculations by using head pressure and fixes field area accounting in cost calculations.
• Implements fixes in result collation, including zero division and single scenario handling.
• Updates and corrects docstrings and variable names for improved code clarity.
• Modifies capital costs related to groundwater bores to more reasonable values

This improves the accuracy and robustness of the model.

In figure below, the blue line represents default config.
The gold line was a scenario run with no capital costs, no pumping costs, and a 99% efficient gravity irrigation system