[kpm] kgp-idea-proto: Create special binaryValidationApiElements configuration

This will be a 'lean' jar file (un-shadowed), which can later
be used by the binary-compatibility-validator to test the
API surface against.

^KT-52568 Verification Pending

libraries/tools/binary-compatibility-validator/build.gradle

@@ -15,7 +15,7 @@ dependencies {
     testArtifacts project(':kotlin-stdlib-jdk8')
     testArtifacts project(':kotlin-reflect')
     testArtifacts project(':kotlin-gradle-plugin-idea')
-    testArtifacts project(':kotlin-gradle-plugin-idea-proto')
+    testArtifacts project(path: ":kotlin-gradle-plugin-idea-proto", configuration: "binaryValidationApiElements")
     testArtifacts project(':kotlin-tooling-core')
 
     testCompileOnly("org.ow2.asm:asm-tree:9.0") {

libraries/tools/binary-compatibility-validator/src/test/kotlin/org.jetbrains.kotlin.tools.tests/RuntimePublicAPITest.kt

@@ -42,7 +42,7 @@ class RuntimePublicAPITest {
 
     @Test fun kotlinGradlePluginIdeaProto() {
         snapshotAPIAndCompare(
-            "../kotlin-gradle-plugin-idea-proto/build/libs", "kotlin-gradle-plugin-idea-proto(?!-[-a-z]+)",
+            "../kotlin-gradle-plugin-idea-proto/build/libs", "kotlin-gradle-plugin-idea-proto-api(?!-[-a-z]+)",
             nonPublicAnnotations = listOf("org/jetbrains/kotlin/gradle/kpm/idea/InternalKotlinGradlePluginApi")
         )
     }

libraries/tools/kotlin-gradle-plugin-idea-proto/build.gradle.kts

@@ -56,6 +56,21 @@ runtimeJar(tasks.register<ShadowJar>("shadowJar")) {
 
 publish()
 
+/* Setup configuration for binary compatibility tests */
+run {
+    val binaryValidationApiElements by configurations.creating {
+        isCanBeResolved = false
+        isCanBeConsumed = true
+    }
+
+    val binaryValidationApiJar = tasks.register<Jar>("binaryValidationApiJar") {
+        this.archiveBaseName.set(project.name + "-api")
+        from(mainSourceSet.output)
+    }
+
+    artifacts.add(binaryValidationApiElements.name, binaryValidationApiJar)
+}
+
 tasks.register<Exec>("protoc") {
     val protoSources = file("src/main/proto")
     val javaOutput = file("src/generated/java/")