Adding C++ frontend as 'optional' integration test dependency to Neo4j (

#1933)

* Adding C++ frontend as 'optional' integration test dependency to Neo4j

* Update cpg-neo4j/build.gradle.kts

Co-authored-by: Maximilian Kaul <maximilian.kaul@aisec.fraunhofer.de>

---------

Co-authored-by: Maximilian Kaul <maximilian.kaul@aisec.fraunhofer.de>

cpg-neo4j/build.gradle.kts

@@ -74,4 +74,11 @@ dependencies {
     annotationProcessor(libs.picocli.codegen)
 
     integrationTestImplementation(libs.kotlin.reflect)
+
+    // We depend on the C++ frontend for the integration tests, but the frontend is only available if enabled.
+    // If it's not available, the integration tests fail (which is ok). But if we would directly reference the
+    // project here, the build system would fail any task since it will not find a non-enabled project.
+    findProject(":cpg-language-cxx")?.also {
+        integrationTestImplementation(it)
+    }
 }