The SDK should issue a build warning when building a macOS app that likely won't run
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- C#
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Description
### Is your feature request related to a problem? Please describe.
On macOS, applications ending in `.App` or `.Service` just....don't work with `dotnet run`. The SDK should give users a heads-up so that we can 'shift-left' this user foot-gun.
### Describe the solution you'd like
The SDK should add a new diagnostic (level=warning) that is fired when a project with an OutputType of Exe is
* built at all when the SDK's 'implicit RuntimeIdentifier' is a macOS RID, and/or
* whenever such a project is built with a RID that is a macOS RID
### Additional context
This bites users somewhat frequently (I've hit it in the past) and is difficult to solve when it does pop up: https://github.com/dotnet/runtime/issues/120935
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