[test] Add the NATIVE backend to non-JVM check blocks in signature tests

(see KT-59204)

compiler/testData/ir/irText/declarations/contextReceivers/contextReceiverMethod.sig.kt.txt

@@ -10,7 +10,7 @@ class Context {
   // CHECK JVM_IR:
   //   Mangled name: Context#foo(){}kotlin.Int
   //   Public signature: /Context.foo|-1256155405684507276[0]
-  // CHECK JS_IR:
+  // CHECK JS_IR NATIVE:
   //   Mangled name: Context#foo(){}
   //   Public signature: /Context.foo|-1041209573719867811[0]
   fun foo(): Int
@@ -41,7 +41,7 @@ class Test {
   // CHECK JVM_IR:
   //   Mangled name: Test#foo(){}kotlin.Int
   //   Public signature: /Test.foo|-1256155405684507276[0]
-  // CHECK JS_IR:
+  // CHECK JS_IR NATIVE:
   //   Mangled name: Test#foo(){}
   //   Public signature: /Test.foo|-1041209573719867811[0]
   fun foo(): Int

compiler/testData/ir/irText/firProblems/kt59102.sig.kt.txt

@@ -9,7 +9,7 @@ class XAlign {
     // CHECK JVM_IR:
     //   Mangled name: XAlign#<get-bits>(){}kotlin.Long
     //   Public signature: /XAlign.bits.<get-bits>|-8015099027032327963[0]
-    // CHECK JS_IR:
+    // CHECK JS_IR NATIVE:
     //   Mangled name: XAlign#<get-bits>(){}
     //   Public signature: /XAlign.bits.<get-bits>|-3920031234897259044[0]
     get