Added more tests around Asset Model

[marcusmoore]

Description

This PR adds some tests around the UI for asset models.

I split out the tests from the existing AssetModelsTest into dedicated AssetModelIndexTest and AssetModelStoreTest classes while also adding a small permission check for each and adding an assertion the model was created.

Builds on to the work in this commit: 233e4af

Type of change

• Testing

[what-the-diff]

PR Summary

• Introduction of New Testing Files
  Two new testing files AssetModelIndexTest.php and AssetModelStoreTest.php have been added. These files are set to provide more specific and targeted testing routes for our application, increasing the reliability of our app's performance.

• Removal of Old Test File
  An outdated or less efficient testing file AssetModelsTest.php has been removed from the system. This is in line with our goal to declutter the codebase and maintain a streamlined, effective testing regime.