Run Azure functions tests on .NET 8 and .NET 9

Author: andrewlock

tracer/build/_build/Build.VariableGenerations.cs

@@ -204,6 +204,8 @@ void GenerateIntegrationTestsWindowsAzureFunctionsMatrix()
                     // new {framework = TargetFramework.NETCOREAPP3_1, runtimeInstall = v3Install, runtimeUninstall = v3Uninstall },
                     new {framework = TargetFramework.NET6_0 },
                     new {framework = TargetFramework.NET7_0 },
+                    new {framework = TargetFramework.NET8_0 },
+                    new {framework = TargetFramework.NET9_0 },
                 };
 
                 var matrix = new Dictionary<string, object>();

tracer/test/test-applications/azure-functions/Samples.AzureFunctions.V4Isolated/Samples.AzureFunctions.V4Isolated.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <ApiVersion Condition="'$(ApiVersion)' == ''">2.0.0</ApiVersion>
-    <TargetFrameworks>net6.0;net7.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
     <AzureFunctionsVersion>v4</AzureFunctionsVersion>
     <OutputType>Exe</OutputType>
     <ImplicitUsings>enable</ImplicitUsings>