Quick revert for #13830

[snipe]

This PR partially reverts #13830, which created a regression where auto-incrementing broke for API requests where an asset tag was not present. The logic of putting that into a form request is sound, but I think it has too many echo effects right now. This PR removes the reference to the StoreAssetRequest and reverts it to the ImageUploadRequest, but does not actually delete the StoreAssetRequest. We might be better suited to use mutators or at least rethink the form request rules.

[shortcut-integration]

This pull request has been linked to Shortcut Story #24098: Asset auto-increment no longer working on the API POST request with no asset_tag field present.

[what-the-diff]

PR Summary

• Modified AssetsController store method parameters
  The store method in the AssetsController now takes an ImageUploadRequest instead of a StoreAssetRequest. This change might enhance the specificity and validation for image uploads in asset creation.

• Added user permission check
  A new check has been introduced to ensure that only authorized users can create a new asset. This addition improves the security and restricts misuse of the application.

• Removed assignment of model_id to Asset
  The direct assignment of model_id to Asset has been removed. This might help avoid wrong assignments and improve data integrity.