[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/SpecialNames/SpecialNames.k2.txt

@@ -0,0 +1,13 @@
+PsiJetFileStubImpl[package=]
+  PACKAGE_DIRECTIVE
+  IMPORT_LIST
+  OBJECT_DECLARATION[classId=/SpecialNames, fqName=SpecialNames, isCompanion=false, isLocal=false, isObjectLiteral=false, isTopLevel=true, name=SpecialNames, superNames=[]]
+    MODIFIER_LIST[public]
+    CLASS_BODY
+      PROPERTY[fqName=SpecialNames.1M, hasDelegate=false, hasDelegateExpression=false, hasInitializer=false, hasReturnTypeRef=true, isExtension=false, isTopLevel=false, isVar=false, name=1M]
+        MODIFIER_LIST[public final]
+        TYPE_REFERENCE
+          USER_TYPE
+            USER_TYPE
+              REFERENCE_EXPRESSION[referencedName=kotlin]
+            REFERENCE_EXPRESSION[referencedName=Int]

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

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 object SpecialNames {
     val `1M` = 1
 }