[FIR] Generate signatures for synthesized class delegation fields

This is to align the behavior with K1.

^KT-57754 Fixed

Co-authored-by: Alexander Udalov <alexander.udalov@jetbrains.com>

compiler/testData/ir/irText/declarations/annotations/inheritingDeprecation.kt

@@ -1,6 +1,3 @@
-// MUTE_SIGNATURE_COMPARISON_K2: ANY
-// ^ KT-57754
-
 interface IFoo {
     @Deprecated("")
     val prop: String get() = ""

compiler/testData/ir/irText/declarations/kt35550.kt

@@ -1,6 +1,3 @@
-// MUTE_SIGNATURE_COMPARISON_K2: ANY
-// ^ KT-57754
-
 interface I {
     val <T> T.id: T
         get() = this

compiler/testData/ir/irText/declarations/parameters/delegatedMembers.kt

@@ -1,6 +1,3 @@
-// MUTE_SIGNATURE_COMPARISON_K2: ANY
-// ^ KT-57754
-
 interface IBase<T> {
     fun foo(x: Int)
     val bar: Int