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

compiler/testData/codegen/box/diagnostics/functions/tailRecursion/thisReferences.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
 
 class A {
     tailrec fun f1(c : Int) {
@@ -28,4 +29,4 @@ fun box() : String {
     A().f1(1000000)
     A().f2(1000000)
     return "OK"
-}
+}