Update CreateSlimBuilder for Microsoft.Extensions.Hosting.Host.CreateEmptyApplicationBuilder

[eerhardt]

Once dotnet/runtime#81280 is implemented, we should take advantage of this new API in CreateSlimBuilder:

aspnetcore/src/DefaultBuilder/src/WebApplicationBuilder.cs

Lines 105 to 113 in 4d75ee9

	_hostApplicationBuilder = new HostApplicationBuilder(new HostApplicationBuilderSettings
	{
	DisableDefaults = true,
	Args = options.Args,
	ApplicationName = options.ApplicationName,
	EnvironmentName = options.EnvironmentName,
	ContentRootPath = options.ContentRootPath,
	Configuration = configuration,
	});

This should cut about 1.3 MB of a NativeAOT published Windows x64 app. Prototyping this change on my machine results the Benchmark app:

Before
15.2 MB (16,007,168 bytes)

After
13.9 MB (14,593,024 bytes)

And 1.4MB on Linux x64:

Before
18.6 MB (19,601,424 bytes)

After
17.2 MB (18,132,768 bytes)

[adityamandaleeka]

Marking this blocked until the runtime API is ready

Thanks for contacting us.

We're moving this issue to the .NET 8 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s).
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