Update SDK to Preview 2 and reaction (#15518)

Author: ViktorHofer

global.json

@@ -1,10 +1,10 @@
 {
   "sdk": {
-    "version": "10.0.100-alpha.1.25077.2",
+    "version": "10.0.100-preview.2.25104.28",
     "rollForward": "latestFeature"
   },
   "tools": {
-    "dotnet": "10.0.100-alpha.1.25077.2"
+    "dotnet": "10.0.100-preview.2.25104.28"
   },
   "msbuild-sdks": {
     "Microsoft.DotNet.Arcade.Sdk": "10.0.0-beta.25105.3",

src/Microsoft.DotNet.Helix/Client/CSharp/Microsoft.DotNet.Helix.Client.csproj

@@ -14,8 +14,11 @@
 
   <ItemGroup>
     <PackageReference Include="Azure.Core" />
-    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" />
     <PackageReference Include="Newtonsoft.Json" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'">
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" />
     <PackageReference Include="System.Collections.Immutable" />
     <PackageReference Include="System.Text.Encodings.Web" />
   </ItemGroup>