[Gradle][MPP] Composite metadata jar: Use "$sourceSetName-cinterop" directory for cinterops

This convention seems to be more robust against clashes against user
specified source set names. We could potentially foresee users to
use "cinterop" as source set name, but the pattern
 $sourceSetName-cinterop seems robust enough.

^KT-49596 Verification Pending

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/native/internal/CInteropCommonizerCompositeMetadataJarBundling.kt

@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.gradle.targets.native.internal
 import org.gradle.api.Project
 import org.gradle.api.tasks.TaskProvider
 import org.gradle.api.tasks.bundling.Zip
+import org.jetbrains.kotlin.gradle.dsl.multiplatformExtensionOrNull
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinSharedNativeCompilation
 import org.jetbrains.kotlin.gradle.targets.native.internal.CInteropCommonizerCompositeMetadataJarBundling.cinteropMetadataDirectoryPath
 
@@ -29,6 +30,6 @@ internal fun Project.includeCommonizedCInteropMetadata(metadataKlib: Zip, compil
 
 internal object CInteropCommonizerCompositeMetadataJarBundling {
     fun cinteropMetadataDirectoryPath(sourceSetName: String): String {
-        return "cinterop/$sourceSetName/"
+        return "$sourceSetName-cinterop"
     }
 }