Default EventSourceSupport to true in ASP.NET Native AOT apps

[eerhardt]

EventSource wasn't supported when publishing an app for NativeAOT in .NET 7. This led to the EventSourceSupport feature switch to being disabled by default in AOT.

In .NET 8 we are getting EventSource to work in Native AOT apps - dotnet/runtime#79241. However, the EventSourceSupport feature switch is still disabled, so users won't be able to use things like dotnet monitor or dotnet counters unless they explicitly opt-in.

We should default EventSourceSupport=true in ASP.NET Native AOT'd applications.

This will add size to the default apps (the estimate is around 1 MB), however the tradeoff is worth it, since EventSource is a very common mechanism used for getting information about a running app.

cc @DamianEdwards @davidfowl @noahfalk @agocke @LakshanF @jkotas @MichalStrehovsky

[davidfowl]

Agree

[agocke]

No argument from me for ASP.NET. For hello, world I think it would ~double the app size, so there seems like a good reason to leave it out there.