Followup to 310cd513d88e3670c7008682ae4b35414084a17d. The `uploadDone`
callback returns the whole upload object, so we need to extract the URL
from it in these cases.
```sh
npx ember-holy-futuristic-template-namespacing-batman-codemod ensure-template-only-has-backing-class
```
We would like to colocate templates but, when no backing class exists, colocated templates extend `templateOnly` instead of `Ember.Component`. Generating the backing class helps avoid any behavioral changes.
We can also run the `tagless-ember-components-codemod` to put the tags into the templates at which point we could convert these back to template-only components.