Updated SubsetService.py to create update_static_elements function

[bdunleavy22]

Refined branch based on #1270.

Added function update_static_elements and modified update for static subsets

[Copilot]

Pull Request Overview

This PR refines the SubsetService.py to improve handling of static subset element updates by introducing a new update_static_elements function and modifying the existing update method to use it.

• Added a new update_static_elements function that provides a more flexible way to update elements in static subsets
• Modified the update method to use the new function for static subsets instead of directly deleting and recreating elements
• Enhanced the get_element_names function to accept both string subset names and Subset objects with improved documentation

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