Switch many common tasks defined in buildSrc to lazy creation

also refactor some locally defined tasks to the creation avoidance API

libraries/stdlib/jvm-minimal-for-test/build.gradle.kts

@@ -75,7 +75,7 @@ publishing {
     publications {
         create<MavenPublication>("internal") {
             artifactId = "kotlin-stdlib-minimal-for-test"
-            artifact(jar)
+            artifact(jar.get())
         }
     }