[K/N, K/JS, K/WASM] Enable FakeOverrideRebuilder by default

While not beeing final solution, this is closer to what
we want to have in the end. Enabling on non-JVM targets
would help better testing.

Enabling in JVM is now not possible yet, as some of the bugs are
not fixed yet (check KT-61360 for details)

^KT-62476

compiler/testData/ir/irText/classes/dataClasses/delegationInSealed.kt

@@ -2,6 +2,10 @@
 // SKIP_KLIB_TEST
 // IGNORE_BACKEND_K1: JS_IR
 
+// KT-64271
+// IGNORE_BACKEND_K2: JVM_IR
+
+
 sealed class A : CharSequence {
     data class B(val c: CharSequence) : A(), CharSequence by c
 }