C#: Add MSTEST test project and check that the call to vstest doesn't get the UseSharedCompilation=false flag forwarded.

Author: michaelnebel

csharp/ql/integration-tests/posix-only/dotnet_test_mstest/UnitTest1.cs

@@ -0,0 +1,10 @@
+namespace dotnet_test_mstest;
+
+[TestClass]
+public class UnitTest1
+{
+    [TestMethod]
+    public void TestMethod1()
+    {
+    }
+}

csharp/ql/integration-tests/posix-only/dotnet_test_mstest/Usings.cs

@@ -0,0 +1 @@
+global using Microsoft.VisualStudio.TestTools.UnitTesting;

csharp/ql/integration-tests/posix-only/dotnet_test_mstest/dotnet_test_mstest.csproj

@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+    <OutputType>Exe</OutputType>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.2.10" />
+    <PackageReference Include="coverlet.collector" Version="3.1.2" />
+  </ItemGroup>
+
+</Project>

csharp/ql/integration-tests/posix-only/dotnet_test_mstest/test.py

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+from create_database_utils import *
+from diagnostics_test_utils import *
+
+# Implicitly build and then run tests.
+run_codeql_database_create(['dotnet test'], test_db="test-db", lang="csharp")
+check_diagnostics()
+
+# Explicitly build and then run tests.
+run_codeql_database_create(['dotnet clean', 'rm -rf test-db', 'dotnet build -o myout --os win', 'dotnet test myout/dotnet_test_mstest.exe'], test_db="test2-db", lang="csharp")
+check_diagnostics(test_db="test2-db")