Show the source of non-curated apps in the search result

## Prerequisites
- [x] I have searched open and closed issues for duplicates.

## Feature
**Is your feature request related to a problem? Please describe.**

When viewing a list of applications in the search result, It is not clear where an application is coming from (flatpak repo, 3rd party apt repo, etc)


As you can see above, there's no way to tell where the two qBittorrents come from. Having a small text beside the name in parenthesis showing its source would help immensely with accessibility.

**Describe the solution you'd like**

What I want to happen is for some indicator text to show where the non-curated apps are coming from.

**Describe alternatives you've considered**

I know that on some entries, AppCenter already allows the user to pick from a drop down on the app page.


But that's not enough IMO because as can be seen in my screenshot, it doesn't work for everything. And in those cases where it fails, it makes the whole experience frustrating.