Consolidate and cleanup media - icons, SVGs and others

Problem/Motivation

The default admin theme has a lot of icons that came in from Gin and Claro that might be duplicates and not used.
So the first step is to find out what is used and where. Remove the extras and then move into switching some elements from loading as a background image.

ChatGPT seemed to find the summary below.
Summary

* Total image/icon assets found: 210
* Referenced somewhere in CSS/JS/Twig/YAML/PHP: ~155
* Not directly referenced by any source file: ~55

The images below seem to repeat.

Proposed resolution

Remove duplicates and replace assets if its the same image under the migration and the regular images folder.