Refactor: Centralize oscarRx JavaScript utilities into shared asset

[coderabbitai]

Description

The toggleSection() and useFav2() functions are currently defined inline in individual JSP files, leading to code duplication and inconsistent behavior across pages.

Current Locations

• toggleSection(): src/main/webapp/oscarRx/ShowAllergies2.jsp:107-119
• useFav2(): src/main/webapp/oscarRx/SideLinksEditFavorites2.jsp:158-160

Recommendation

Move these utilities to a centralized JavaScript file such as:

• /share/javascript/Oscar.js, or
• A new /oscarRx/rx-common.js

Benefits

• Easier to maintain and test
• Consistent behavior across all pages
• Reduces code duplication
• Single source of truth for shared functionality

Reference

• PR: Fix: resolve JavaScript/Java errors in oscarRx prescription module (Search Drug3, ShowAllergies2, StaticScript, SideLinks, RxSearchAllergy2Form) #1863
• Identified by: Sourcery-ai and Claude bot reviews
• Requested by: @yingbull