Fix ConcurrentModificationException

This exception is happening on build configuration trying to remove
default jar task artifacts from published one. I've set 'jar' task
to be always disabled instead and just add shadow jar to artifacts.

buildSrc/src/main/kotlin/artifacts.kt

@@ -47,26 +47,29 @@ fun Project.testsJar(body: Jar.() -> Unit = {}): Jar {
     }
 }
 
-var Project.artifactsRemovedDiagnosticFlag: Boolean
-    get() = extra.has("artifactsRemovedDiagnosticFlag") && extra["artifactsRemovedDiagnosticFlag"] == true
-    set(value) {
-        extra["artifactsRemovedDiagnosticFlag"] = value
-    }
+fun Project.setPublishableArtifact(
+    jarTask: TaskProvider<out Jar>
+) {
+    addArtifact("runtimeElements", jarTask)
+    addArtifact("apiElements", jarTask)
+    addArtifact("archives", jarTask)
+}
 
-fun Project.removeArtifacts(configuration: Configuration, task: Task) {
-    configuration.artifacts.removeAll { artifact ->
-        artifact.file in task.outputs.files
-    }
-
-    artifactsRemovedDiagnosticFlag = true
+fun removeJarTaskArtifact(
+    jarTask: TaskProvider<out Jar>
+): Configuration.() -> Unit = {
+    val jarFile = jarTask.get().archiveFile.get().asFile
+    artifacts.removeIf { it.file == jarFile }
 }
 
 fun Project.noDefaultJar() {
-    tasks.named("jar").configure {
-        configurations.forEach { cfg ->
-            removeArtifacts(cfg, this)
-        }
+    val jarTask = tasks.named<Jar>("jar") {
+        enabled = false
     }
+
+    configurations.named("apiElements", removeJarTaskArtifact(jarTask))
+    configurations.named("runtimeElements", removeJarTaskArtifact(jarTask))
+    configurations.named("archives", removeJarTaskArtifact(jarTask))
 }
 
 fun Jar.addEmbeddedRuntime() {