[FIR] Fix naming of local classes when serializing metadata

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

compiler/testData/codegen/box/closures/subclosuresWithinInitializers.jvm_abi.txt

@@ -1,9 +0,0 @@
-MODULE main
-	CLASS Outer$foo$Local.class
-		CLASS METADATA
-			PROPERTY getObj()LOuter$foo$Local$obj$1;
-				Property: class.metadata.property.returnType
-					K1
-						.Outer$foo$Local$obj$1
-					K2
-						.Outer$foo$Local.<no name provided>

compiler/testData/codegen/box/closures/subclosuresWithinInitializers.kt

@@ -1,5 +1,3 @@
-// JVM_ABI_K1_K2_DIFF: KT-63868
-
 fun <R> run(block: () -> R) = block()
 inline fun <R> inlineRun(block: () -> R) = block()