Replace all occurrences of WITH_RUNTIME with WITH_STDLIB

We are going to deprecate `WITH_RUNTIME` directive. The main reason
behind this change is that `WITH_STDLIB` directive better describes
its meaning, specifically it will add kotlin stdlib to test's classpath.

compiler/testData/codegen/box/script/scriptNestedClassInstance.kt

@@ -1,7 +1,7 @@
 // TARGET_BACKEND: JVM
 // IGNORE_BACKEND_FIR: JVM_IR
 // IGNORE_LIGHT_ANALYSIS
-// WITH_RUNTIME
+// WITH_STDLIB
 // FILE: test.kt
 
 fun box(): String =