Reduce exceptions thrown in Aspire.Hosting

Exceptions thrown in the app host are always printed to the debug console. Althrough the errors are handled, they add noise the debug console. For example, https://github.com/dotnet/aspire/issues/7486

Common exceptions:
- k8s.Autorest throws `HttpOperationException` in many situations. For example, `GetAsync` for a resource that doesn't exist throws the error. I'm not sure what options there are to suppress them.
- `OperationCanceledException` is thrown from many canceled async operations. For example, canceling watching for resource notifications. `ConfigureAwaitOptions.NoThrow` could be used to stop them. Or gracefully completing channels when we no longer want to read from them instead of aborting read with a cancellation token.