[FIR] Fix naming of local classes when serializing metadata

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

compiler/testData/codegen/box/regressions/kt3850.jvm_abi.txt

@@ -1,9 +0,0 @@
-MODULE main
-	CLASS One.class
-		CLASS METADATA
-			PROPERTY getA1()[LOne$a1$1;
-				Property: class.metadata.property.returnType
-					K1
-						kotlin/Array<.One$a1$1>
-					K2
-						kotlin/Array<.One.<no name provided>>

compiler/testData/codegen/box/regressions/kt3850.kt

@@ -2,7 +2,6 @@
 
 // In light analysis mode, anonymous object type is approximated to the supertype, so `fy` is unresolved.
 // IGNORE_LIGHT_ANALYSIS
-// JVM_ABI_K1_K2_DIFF: KT-63655
 
 private class One {
     val a1 = arrayOf(