[IR] Don't print multifile/synthetic facade class names in irText tests

This only applies to JVM and fq-names in declaration references
in IR dumps.

This enables us to run more irText tests on platforms other than JVM
(see KT-58605).

compiler/testData/ir/irText/declarations/contextReceivers/thisWithCustomLabel.kt

@@ -1,9 +1,7 @@
 // FIR_IDENTICAL
 // !LANGUAGE: +ContextReceivers
-// IGNORE_BACKEND_K1: JS_IR
-// IGNORE_BACKEND_K1: JS_IR_ES6
 
-// MUTE_SIGNATURE_COMPARISON_K2: ANY
+// MUTE_SIGNATURE_COMPARISON_K2: JVM_IR
 // ^ KT-57429
 
 class A<T>(val a: T)