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/inference/builderInference/kt48633.kt

@@ -1,6 +1,6 @@
 // DONT_TARGET_EXACT_BACKEND: WASM
 // IGNORE_BACKEND_FIR: JVM_IR
-// WITH_RUNTIME
+// WITH_STDLIB
 
 class TowerDataElementsForName() {
     @OptIn(ExperimentalStdlibApi::class)