Added ability to filter in user's assigned assets by category ID and model ID

[snipe]

This adds additional filters to the user's asset API endpoint that should let the API return filtered results showing only a user's assets that match a particular category or model ID.

In going through this work, I realize we have some inconsistencies in how we reference our query scopes. Many of them are quite old, and the notion of adding scopes to search on names in addition to ID numbers wasn't on our radar back then.

In v7, I hope to refactor those scope names so that they're a little clearer when the scope is looking at an ID or looking for a name search.

[shortcut-integration]

This pull request has been linked to Shortcut Story #25173: Add ability to scope users/{:id}/assets by category ID.

[what-the-diff]

PR Summary

• Improved Search Functionality in User Panel
  The additions to the file UsersController.php now allow for the application to filter search results based on category and model IDs within the user panel. This enhancement simplifies the process for users to locate their desired items swiftly by narrowing down the results according to the specific item category or model they specify.