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/operatorsOverloading/kt45503_1.kt

@@ -1,6 +1,6 @@
 // FIR_IDENTICAL
 // !DIAGNOSTICS: -UNUSED_PARAMETER
-// WITH_RUNTIME
+// WITH_STDLIB
 // SKIP_TXT
 
 class A<T>

compiler/testData/diagnostics/tests/operatorsOverloading/kt45503_2.kt

@@ -1,5 +1,5 @@
 // FIR_IDENTICAL
-// WITH_RUNTIME
+// WITH_STDLIB
 // SKIP_TXT
 
 class A<T>(var x: T)

compiler/testData/diagnostics/tests/operatorsOverloading/kt45503_3.kt

@@ -1,6 +1,6 @@
 // FIR_IDENTICAL
 // !DIAGNOSTICS: -UNUSED_PARAMETER
-// WITH_RUNTIME
+// WITH_STDLIB
 // SKIP_TXT
 
 class A<T>

compiler/testData/diagnostics/tests/operatorsOverloading/plusAssignOnVarAndCollections.kt

@@ -1,5 +1,5 @@
 // FIR_IDENTICAL
-// WITH_RUNTIME
+// WITH_STDLIB
 
 fun test1() {
     var list = ArrayList<Int>()