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/diagnostics/tests/callableReference/resolve/resolveReferenceAgainstKFunctionAndKPrpoerty.kt

@@ -1,5 +1,5 @@
 // FIR_IDENTICAL
-// WITH_RUNTIME
+// WITH_STDLIB
 // !DIAGNOSTICS: -UNUSED_PARAMETER
 
 fun <T, R> foo(x: kotlin.reflect.KFunction1<T, R>) {}

compiler/testData/diagnostics/tests/callableReference/resolve/resolveTwoReferencesAgainstGenerics.kt

@@ -1,7 +1,7 @@
 // FIR_IDENTICAL
 // !LANGUAGE: +NewInference
 // !DIAGNOSTICS: -UNUSED_PARAMETER
-// WITH_RUNTIME
+// WITH_STDLIB
 
 
 fun <T> List<Option<T>>.flatten(): List<T> = flatMap { it.fold(::emptyList, ::listOf) }