C#: Add buildless integration test example including .slnx file.

Author: michaelnebel

csharp/ql/integration-tests/all-platforms/standalone_slnx/CompilationInfo.expected

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+| All NuGet feeds reachable | 1.0 |
+| Failed project restore with package source error | 0.0 |
+| Failed solution restore with package source error | 0.0 |
+| Inherited NuGet feed count | 1.0 |
+| NuGet feed responsiveness checked | 1.0 |
+| Project files on filesystem | 2.0 |
+| Reachable fallback NuGet feed count | 1.0 |
+| Resource extraction enabled | 0.0 |
+| Restored .NET framework variants | 1.0 |
+| Restored projects through solution files | 0.0 |
+| Solution files on filesystem | 0.0 |
+| Source files generated | 1.0 |
+| Source files on filesystem | 2.0 |
+| Successfully restored project files | 2.0 |
+| Successfully restored solution files | 0.0 |
+| Unresolved references | 0.0 |
+| UseWPF set | 0.0 |
+| UseWindowsForms set | 0.0 |
+| WebView extraction enabled | 1.0 |

csharp/ql/integration-tests/all-platforms/standalone_slnx/CompilationInfo.ql

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+import csharp
+import semmle.code.csharp.commons.Diagnostics
+
+query predicate compilationInfo(string key, float value) {
+  key != "Resolved references" and
+  key != "Resolved assembly conflicts" and
+  not key.matches(["Compiler diagnostic count for%", "Extractor message count for group%"]) and
+  exists(Compilation c, string infoKey, string infoValue | infoValue = c.getInfo(infoKey) |
+    key = infoKey and
+    value = infoValue.toFloat()
+    or
+    not exists(infoValue.toFloat()) and
+    key = infoKey + ": " + infoValue and
+    value = 1
+  )
+}

csharp/ql/integration-tests/all-platforms/standalone_slnx/global.json

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+{
+    "sdk": {
+        "version": "10.0.100"
+    }
+}

csharp/ql/integration-tests/all-platforms/standalone_slnx/mylib/Class1.cs

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+namespace mylib;
+
+public class Class1
+{
+
+}

csharp/ql/integration-tests/all-platforms/standalone_slnx/mylib/mylib.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

csharp/ql/integration-tests/all-platforms/standalone_slnx/proj/Program.cs

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+// See https://aka.ms/new-console-template for more information
+Console.WriteLine("Hello, World!");

csharp/ql/integration-tests/all-platforms/standalone_slnx/proj/proj.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

csharp/ql/integration-tests/all-platforms/standalone_slnx/test.py

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

csharp/ql/integration-tests/all-platforms/standalone_slnx/test.slnx

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+<Solution>
+  <Project Path="mylib/mylib.csproj" />
+  <Project Path="proj/proj.csproj" />
+</Solution>