Updating target framework to use net6.0 (#1980)

* Updating target framework to use net6.0

* Disabling generation of reference assemblies for C# tests

Author: jaygullapalli

src/csharp/Tests/FunctionalTests/Microsoft.Azure.Kinect.Sensor.FunctionalTests.csproj

@@ -2,14 +2,15 @@
   <Import Project="..\..\k4a.props" />
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
 
     <IsPackable>false</IsPackable>
 
     <Platforms>x64;x86</Platforms>
     <RunCodeAnalysis>false</RunCodeAnalysis>
     <CodeAnalysisRuleSet>..\..\AzureKinectSensorSDK.ruleset</CodeAnalysisRuleSet>
     <OutputPath>$(BaseOutputPath)\$(AssemblyName)\</OutputPath>
+    <ProduceReferenceAssembly>false</ProduceReferenceAssembly>
   </PropertyGroup>
 
   <ItemGroup>

src/csharp/Tests/StubGenerator.UnitTests/Microsoft.Azure.Kinect.Sensor.Test.StubGenerator.UnitTests.csproj

@@ -2,7 +2,7 @@
   <Import Project="..\..\k4a.props" />
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
 
     <IsPackable>false</IsPackable>
 
@@ -12,6 +12,7 @@
     <OutputPath>$(BaseOutputPath)\$(AssemblyName)\</OutputPath>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>..\..\Microsoft.Azure.Kinect.Sensor.snk</AssemblyOriginatorKeyFile>
+    <ProduceReferenceAssembly>false</ProduceReferenceAssembly>
   </PropertyGroup>
 
   <ItemGroup>

src/csharp/Tests/UnitTests/Microsoft.Azure.Kinect.Sensor.UnitTests.csproj

@@ -2,7 +2,7 @@
   <Import Project="..\..\k4a.props" />
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
 
     <IsPackable>false</IsPackable>
 
@@ -12,6 +12,7 @@
     <OutputPath>$(BaseOutputPath)\$(AssemblyName)\</OutputPath>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>..\..\Microsoft.Azure.Kinect.Sensor.snk</AssemblyOriginatorKeyFile>
+    <ProduceReferenceAssembly>false</ProduceReferenceAssembly>
   </PropertyGroup>
 
   <ItemGroup>