Code coverage reporting using popular tools does not work with Aspire.Hosting.Testing

### Is there an existing issue for this?

- [x] I have searched the existing issues

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

When using Aspire.Hosting.Testing to run integration tests, and using [coverlet.msbuild](https://github.com/coverlet-coverage/coverlet) we had no coverage reported for our tests, regardless of what code they exercised. This reduces the value of the tests that otherwise provide a great amount of value by exercising our system front-to-back.

### Describe the solution you'd like

It would be useful if coverage tooling that already exists would just work ™, however I appreciate that given how different running an application in Aspire/DistributedApplicationFactory is from something like WebApplicationFactory, that may be unworkable.

I think whatever the solution, it will require some collaboration with the maintainers of coverage tooling.

### Additional context

_No response_