Configuration caching - register listener only once per project

To many listeners cause performance issues in Gradle.

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinGradleBuildServices.kt

@@ -77,9 +77,9 @@ internal class KotlinGradleBuildServices private constructor(
                 listenerRegistryHolder.listenerRegistry!!.onTaskCompletion(kotlinGradleListenerProvider)
             } else {
                 gradle.addBuildListener(services)
-                instance = services
                 log.kotlinDebug(INIT_MESSAGE)
             }
+            instance = services
 
             services.buildStarted()
             return services

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/statistics/KotlinBuildStatsService.kt

@@ -113,9 +113,10 @@ internal abstract class KotlinBuildStatsService internal constructor() : BuildAd
                             log.debug("Instantiated ${KotlinBuildStatsService::class.java}: new instance $instance")
                             mbs.registerMBean(StandardMBean(newInstance, KotlinBuildStatsMXBean::class.java), beanName)
                         }
-                    }
-                    if (!isConfigurationCacheAvailable(gradle)) {
-                        gradle.addBuildListener(instance)
+
+                        if (!isConfigurationCacheAvailable(gradle)) {
+                            gradle.addBuildListener(instance)
+                        }
                     }
                     instance
                 }