C#: Add buildless integration test with .net 8.0

Author: tamasvajk

csharp/ql/integration-tests/posix/standalone_dependencies_net8/Assemblies.ql

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+import csharp
+
+from Assembly a
+where not a.getCompilation().getOutputAssembly() = a
+select a

csharp/ql/integration-tests/posix/standalone_dependencies_net8/Program.cs

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+class Program
+{
+    static void Main(string[] args)
+    {
+    }
+}

csharp/ql/integration-tests/posix/standalone_dependencies_net8/global.json

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+{
+  "sdk": {
+    "version": "8.0.407"
+  }
+}

csharp/ql/integration-tests/posix/standalone_dependencies_net8/standalone.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>net8.0</TargetFrameworks>
+  </PropertyGroup>
+
+  <Target Name="DeleteBinObjFolders" BeforeTargets="Clean">
+    <RemoveDir Directories=".\bin" />
+    <RemoveDir Directories=".\obj" />
+  </Target>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
+    <!-- The below causes DB-CHECK errors: -->
+    <!-- <PackageReference Include="NUnit" Version="3.10.1" /> -->
+    <PackageReference Include="Avalara.AvaTax" Version="23.11.0" />
+  </ItemGroup>
+</Project>

csharp/ql/integration-tests/posix/standalone_dependencies_net8/test.py

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+import runs_on
+
+
+@runs_on.posix
+def test(codeql, csharp):
+    codeql.database.create(build_mode="none")