fix: resolve jQuery conflict breaking admin autocomplete fields in Django 5

[iloveagent57]

The admin's SortedModelSelect2Multiple widgets were broken because:

1. Django admin namespaces jQuery as django.jQuery and removes $ from global scope
2. The Media class was loading bower's jQuery which overwrote $ with a new instance
3. Select2 was attached to django.jQuery but code was calling $().select2()

This fix:

• Adds jquery_shim.js to expose django.jQuery as global $ and jQuery
• Wraps sortable_select.js in IIFE using django.jQuery
• Removes conflicting bower jQuery from Media classes

ENT-11757

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[iloveagent57]

closed in favor of: #4718