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/boxModernJdk/testsWithJava11/kt36984.kt

@@ -2,7 +2,7 @@
 // IGNORE_BACKEND: JVM_IR
 //  ^ JVM_IR back-end generates SAM conversion with invokedynamic
 // IGNORE_BACKEND_FIR: JVM_IR
-// WITH_RUNTIME
+// WITH_STDLIB
 
 fun box(): String {
     val f = {}