[FIR JS] KT-57601: Get rid of the builtin provider

In this example we get 2 variants of `kotlin/toString()`:
one coming from the KLib provider, and the
other coming from the builtins provider.
These are identical deserialized functions.

^KT-57601 Fixed

compiler/testData/ir/irText/classes/cloneable.kt

@@ -2,6 +2,9 @@
 // SKIP_KLIB_TEST
 // IGNORE_BACKEND_K1: JS_IR
 // IGNORE_BACKEND_K1: JS_IR_ES6
+// IGNORE_BACKEND_K2: JS_IR
+// IGNORE_BACKEND_K2: JS_IR_ES6
+// STATUS: This should not work in JS, Cloneable is JVM-specific API
 
 class A : Cloneable