Error logs output from the apphost and dcp don't show up during `aspire run`

Any errors that come from dcp or the apphost itself don't show up when using aspire run. This makes it really hard to diagnose problems (we hit this on the live stream with port conflicts).

Generally, we need a first-class way to capture logs from the app host without parsing the console output. I think that means a custom logger provider that writes logs to the back channel in a structured way so that the cli can build custom rendering on top.