[FIR] Fix naming of local classes when serializing metadata

^KT-63655: Fixed
^KT-63901: Fixed
^KT-63988: Fixed

compiler/testData/codegen/box/compileKotlinAgainstKotlin/fir/AnonymousObjectInProperty.jvm_abi.txt

@@ -1,9 +0,0 @@
-MODULE lib
-	CLASS A.class
-		CLASS METADATA
-			PROPERTY x
-				Property: class.metadata.property.returnType
-					K1
-						.A$x$1
-					K2
-						.A.<no name provided>

compiler/testData/codegen/box/compileKotlinAgainstKotlin/fir/AnonymousObjectInProperty.kt

@@ -1,6 +1,5 @@
 // TARGET_BACKEND: JVM
 // MODULE: lib
-// JVM_ABI_K1_K2_DIFF: KT-63868
 
 // FILE: A.kt
 abstract class A {