[stub builder] generate K2 test output for the testsuite where classfiles are generated by the K2 compiler

The result of k1/k2 should be similar here, the differences should be fixed by KT-60764

analysis/decompiled/decompiler-to-file-stubs/testData/clsFileStubBuilder/Const/Const.k2.txt

@@ -0,0 +1,15 @@
+PsiJetFileStubImpl[package=test]
+  PACKAGE_DIRECTIVE
+    REFERENCE_EXPRESSION[referencedName=test]
+  IMPORT_LIST
+  OBJECT_DECLARATION[classId=test/Const, fqName=test.Const, isCompanion=false, isLocal=false, isObjectLiteral=false, isTopLevel=true, name=Const, superNames=[]]
+    MODIFIER_LIST[public]
+    CLASS_BODY
+      PROPERTY[fqName=test.Const.inObject, hasDelegate=false, hasDelegateExpression=false, hasInitializer=true, hasReturnTypeRef=true, isExtension=false, isTopLevel=false, isVar=false, name=inObject]
+        MODIFIER_LIST[private final const]
+        TYPE_REFERENCE
+          USER_TYPE
+            USER_TYPE
+              REFERENCE_EXPRESSION[referencedName=kotlin]
+            REFERENCE_EXPRESSION[referencedName=Int]
+        REFERENCE_EXPRESSION[referencedName=COMPILED_CODE]

analysis/decompiled/decompiler-to-file-stubs/testData/clsFileStubBuilder/Const/Const.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 package test
 
 object Const {