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

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

@@ -5,6 +5,7 @@
 // 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 test(x : Int) : Int =
     if (x == 1) {
@@ -16,4 +17,4 @@ tailrec fun test(x : Int) : Int =
         0
     }
 
-fun box() : String = if (test(1000000) == 1) "OK" else "FAIL"
+fun box() : String = if (test(1000000) == 1) "OK" else "FAIL"