Added configuring <SingleNativeTarget> for subprojects nativeProject form testDsl

#KT-51553 In Progress

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/testbase/testDsl.kt

@@ -108,6 +108,7 @@ fun KGPBaseTest.nativeProject(
     buildJdk: File? = null,
     localRepoDir: Path? = null,
     environmentVariables: EnvironmentalVariables = EnvironmentalVariables(),
+    configureSubProjects: Boolean = false,
     test: TestProject.() -> Unit = {},
 ): TestProject {
     val project = project(
@@ -123,7 +124,7 @@ fun KGPBaseTest.nativeProject(
         localRepoDir = localRepoDir,
         environmentVariables = environmentVariables,
     )
-    project.configureSingleNativeTarget()
+    project.configureSingleNativeTarget(configureSubProjects)
     project.test()
     return project
 }
@@ -645,11 +646,27 @@ private fun GradleProject.addHeapDumpOptions() {
 private const val SINGLE_NATIVE_TARGET_PLACEHOLDER = "<SingleNativeTarget>"
 private const val LOCAL_REPOSITORY_PLACEHOLDER = "<localRepo>"
 
-private fun TestProject.configureSingleNativeTarget(preset: String = HostManager.host.presetName) {
+private fun TestProject.configureSingleNativeTarget(
+    configureSubProjects: Boolean = false,
+    preset: String = HostManager.host.presetName,
+) {
     val buildScript = if (buildGradle.exists()) buildGradle else buildGradleKts
     buildScript.modify {
         it.replace(SINGLE_NATIVE_TARGET_PLACEHOLDER, preset)
     }
+    if (configureSubProjects) {
+        configureSingleNativeTargetInSubFolders(preset)
+    }
+}
+
+private fun TestProject.configureSingleNativeTargetInSubFolders(preset: String = HostManager.host.presetName) {
+    projectPath.toFile().walk()
+        .filter { it.isFile && (it.name == "build.gradle.kts" || it.name == "build.gradle") }
+        .forEach { file ->
+            file.modify {
+                it.replace(SINGLE_NATIVE_TARGET_PLACEHOLDER, preset)
+            }
+        }
 }
 
 private fun TestProject.configureLocalRepository(localRepoDir: Path) {