[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/TopJvmPackageName/TopJvmPackageName.k2.txt

@@ -0,0 +1,21 @@
+PsiJetFileStubImpl[package=some.other]
+  PACKAGE_DIRECTIVE
+    DOT_QUALIFIED_EXPRESSION
+      REFERENCE_EXPRESSION[referencedName=some]
+      REFERENCE_EXPRESSION[referencedName=other]
+  IMPORT_LIST
+  FUN[fqName=some.other.foo, hasBlockBody=true, hasBody=true, hasTypeParameterListBeforeFunctionName=false, isExtension=false, isTopLevel=true, mayHaveContract=false, name=foo]
+    MODIFIER_LIST[public]
+      ANNOTATION_ENTRY[hasValueArguments=false, shortName=SinceKotlin]
+        CONSTRUCTOR_CALLEE
+          TYPE_REFERENCE
+            USER_TYPE
+              USER_TYPE
+                REFERENCE_EXPRESSION[referencedName=kotlin]
+              REFERENCE_EXPRESSION[referencedName=SinceKotlin]
+    VALUE_PARAMETER_LIST
+    TYPE_REFERENCE
+      USER_TYPE
+        USER_TYPE
+          REFERENCE_EXPRESSION[referencedName=kotlin]
+        REFERENCE_EXPRESSION[referencedName=Unit]

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

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 @file:Suppress("UNCHECKED_CAST", "NOTHING_TO_INLINE", "INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
 @file:JvmName("OtherKt")
 @file:kotlin.jvm.JvmPackageName("some.other.jvm")