Merge pull request #21026 from michaelnebel/csharp/migratesolution

C#: Migrate our own solution file to `.slnx`.

Author: michaelnebel

csharp/.vscode/settings.json

@@ -10,5 +10,5 @@
     "omnisharp.enableRoslynAnalyzers": true,
     "csharpFormatUsings.splitGroups": false,
     "csharpFormatUsings.sortOrder": "Xunit System Microsoft Semmle.Util Semmle",
-    "dotnet.defaultSolution": "CSharp.sln"
-}
+    "dotnet.defaultSolution": "CSharp.slnx"
+}

csharp/CSharp.sln

@@ -0,0 +1,25 @@
+<Solution>
+  <Project Path="autobuilder/Semmle.Autobuild.Cpp.Tests/Semmle.Autobuild.Cpp.Tests.csproj">
+    <Build Solution="Release|*" Project="false" />
+  </Project>
+  <Project Path="autobuilder/Semmle.Autobuild.Cpp/Semmle.Autobuild.Cpp.csproj" />
+  <Project Path="autobuilder/Semmle.Autobuild.CSharp.Tests/Semmle.Autobuild.CSharp.Tests.csproj">
+    <Build Solution="Release|*" Project="false" />
+  </Project>
+  <Project Path="autobuilder/Semmle.Autobuild.CSharp/Semmle.Autobuild.CSharp.csproj" />
+  <Project Path="autobuilder/Semmle.Autobuild.Shared/Semmle.Autobuild.Shared.csproj" />
+  <Project Path="extractor/Semmle.Extraction.CSharp.DependencyFetching/Semmle.Extraction.CSharp.DependencyFetching.csproj" />
+  <Project Path="extractor/Semmle.Extraction.CSharp.DependencyStubGenerator/Semmle.Extraction.CSharp.DependencyStubGenerator.csproj" />
+  <Project Path="extractor/Semmle.Extraction.CSharp.Driver/Semmle.Extraction.CSharp.Driver.csproj" />
+  <Project Path="extractor/Semmle.Extraction.CSharp.Standalone/Semmle.Extraction.CSharp.Standalone.csproj" />
+  <Project Path="extractor/Semmle.Extraction.CSharp.StubGenerator/Semmle.Extraction.CSharp.StubGenerator.csproj" />
+  <Project Path="extractor/Semmle.Extraction.CSharp.Util/Semmle.Extraction.CSharp.Util.csproj" />
+  <Project Path="extractor/Semmle.Extraction.CSharp/Semmle.Extraction.CSharp.csproj" />
+  <Project Path="extractor/Semmle.Extraction.Tests/Semmle.Extraction.Tests.csproj">
+    <Build Solution="Release|*" Project="false" />
+  </Project>
+  <Project Path="extractor/Semmle.Util.Tests/Semmle.Util.Tests.csproj">
+    <Build Solution="Release|*" Project="false" />
+  </Project>
+  <Project Path="extractor/Semmle.Util/Semmle.Util.csproj" />
+</Solution>