[K/N][build] Cleanup obsolete build tasks

* Remove obsolete reporting
* Remove old build tasks: BuildPusher and CollisionDetector
* Gradle build file cleanup
* Remove old wrappers

Merge-request: KT-MR-8788
Merged-by: Pavel Punegov <Pavel.Punegov@jetbrains.com>

kotlin-native/shared/build.gradle.kts

@@ -16,14 +16,13 @@
 @file:Suppress("UnstableApiUsage")
 
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
-import org.jetbrains.kotlin.gradle.plugin.KotlinSourceSet
 
 plugins {
     id("kotlin")
 }
 
 val rootBuildDirectory by extra(file(".."))
-apply(from="../gradle/loadRootProperties.gradle")
+apply(from = "../gradle/loadRootProperties.gradle")
 
 val kotlinVersion = project.bootstrapKotlinVersion
 
@@ -34,12 +33,16 @@ repositories {
     mavenCentral()
 }
 
-sourceSets["main"].withConvention(KotlinSourceSet::class) {
-    kotlin.srcDir("src/main/kotlin")
-    kotlin.srcDir("src/library/kotlin")
+kotlin {
+    sourceSets {
+        main {
+            kotlin.srcDir("src/main/kotlin")
+            kotlin.srcDir("src/library/kotlin")
+        }
+    }
 }
 
-tasks.withType<KotlinCompile> {
+tasks.withType<KotlinCompile>().configureEach {
     kotlinOptions.jvmTarget = "1.8"
     kotlinOptions.freeCompilerArgs += listOf("-Xskip-prerelease-check")
 }