Clean up unsupported native AOT flags (#2616)

* Clean up unsupported native AOT flags

* `llcOptimizationPreference` was renamed to `OptimizationPreference` and became supported in .NET 8 (or maybe .NET 7, it doesn't matter)
* `IlcGenerateStackTraceData` is now `StackTraceSupport` and supported. (Also got renamed in .NET 8 or earlier.)

I'm leaving the old names of properties for backcompat. We could also delete them. I don't know how much BDN cares about .NET versions that are out of support.

IlcGenerateCompleteTypeMetadata is unsupported, we don't test it, it's a mode for troubleshooting trimming issues for people who ignore trimming warnings. I don't think BDN should be setting this. You'll only find bugs (dotnet/runtime#106439). So deleting that. Not deleting the API because it looks to be a public API.

Co-authored-by: Adeel Mujahid <3840695+am11@users.noreply.github.com>

src/BenchmarkDotNet/Toolchains/NativeAot/Generator.cs

@@ -133,11 +133,12 @@ private string GenerateProjectForNuGetBuild(BuildPartition buildPartition, Artif
     <UseSharedCompilation>false</UseSharedCompilation>
     <Deterministic>true</Deterministic>
     <RunAnalyzers>false</RunAnalyzers>
-    <PublishAot Condition="" '$(TargetFramework)' != 'net6.0' "">true</PublishAot>
+    <PublishAot Condition=""$([MSBuild]::VersionGreaterThan('$(NETCoreSdkVersion)', '6.0'))"">true</PublishAot>
     <IlcOptimizationPreference>{ilcOptimizationPreference}</IlcOptimizationPreference>
+    <OptimizationPreference>{ilcOptimizationPreference}</OptimizationPreference>
     {GetTrimmingSettings()}
-    <IlcGenerateCompleteTypeMetadata>{ilcGenerateCompleteTypeMetadata}</IlcGenerateCompleteTypeMetadata>
     <IlcGenerateStackTraceData>{ilcGenerateStackTraceData}</IlcGenerateStackTraceData>
+    <StackTraceSupport>{ilcGenerateStackTraceData}</StackTraceSupport>
     <EnsureNETCoreAppRuntime>false</EnsureNETCoreAppRuntime> <!-- workaround for 'This runtime may not be supported by.NET Core.' error -->
     <ErrorOnDuplicatePublishOutputFiles>false</ErrorOnDuplicatePublishOutputFiles> <!-- workaround for 'Found multiple publish output files with the same relative path.' error -->
     <ValidateExecutableReferencesMatchSelfContained>false</ValidateExecutableReferencesMatchSelfContained>