Set java.class.path property in runner and loader

#KT-24991 fixed

compiler/testData/launcher/classPathPropTest.kts

@@ -0,0 +1,9 @@
+package test
+
+import java.io.File
+
+val classPathFromProp = System.getProperty("java.class.path")
+
+val jarFromProps = classPathFromProp.split(File.pathSeparator).firstOrNull { it.contains("kotlin-compiler") }
+
+println(jarFromProps?.let { File(it).name } ?: "kotlin-compiler not found in the java.class.path property: $classPathFromProp")