jvm-abi-gen: Remove effectively private classes from ABI

#KT-64590 Fixed

plugins/jvm-abi-gen/testData/compile/multifileClassOptimizedWithRemovePrivateOption/lib/part1.kt

@@ -0,0 +1,7 @@
+@file:JvmMultifileClass
+@file:JvmName("Multifile")
+package lib
+
+typealias T1 = String
+fun f1() {}
+val v1: T1 = "OK"

plugins/jvm-abi-gen/testData/compile/multifileClassOptimizedWithRemovePrivateOption/lib/part2.kt

@@ -0,0 +1,7 @@
+@file:JvmMultifileClass
+@file:JvmName("Multifile")
+package lib
+
+typealias T2 = String
+fun f2() {}
+val v2: T2 = "OK"