[K/N][perf] Cleanup build scripts

Remove hack with including sources directories.
shared project directory was removed from native and merged with utils.
Also, remove native/utils inclusion. Bootstrap version is used instead.

kotlin-native/performance/buildSrc/build.gradle.kts

@@ -40,10 +40,7 @@ tasks.validatePlugins.configure {
 
 sourceSets["main"].kotlin {
     srcDir("src/main/kotlin")
-    srcDir("../../shared/src/library/kotlin")
-    srcDir("../../shared/src/main/kotlin")
     srcDir("../../tools/benchmarks/shared/src/main/kotlin/report")
-    srcDir("../../../native/utils/src")
 }
 
 tasks.withType<KotlinCompile>().configureEach {