[Test] Enable reporting errors from fronted to testdata of codegen tests

compiler/testData/codegen/box/diagnostics/functions/tailRecursion/whenWithInRange.kt

@@ -7,6 +7,7 @@
 // TODO: muted automatically, investigate should it be ran for JS or not
 // DONT_RUN_GENERATED_CODE: JS
 // IGNORE_BACKEND: JS
+// IGNORE_FIR_DIAGNOSTICS_DIFF
 
 tailrec fun withWhen(counter : Int, d : Any) : Int =
         when (counter) {
@@ -18,4 +19,4 @@ tailrec fun withWhen(counter : Int, d : Any) : Int =
             else -> withWhen(counter - 1, "else")
         }
 
-fun box() : String = if (withWhen(100000, "test") == 1) "OK" else "FAIL"
+fun box() : String = if (withWhen(100000, "test") == 1) "OK" else "FAIL"