JS: replace all usages of @native annotation with external modifier, in tests, stdlib, etc

compiler/testData/diagnostics/testsWithJsStdLib/native/nativeSetter/onNativeClassMembers.kt

@@ -1,7 +1,6 @@
-// !DIAGNOSTICS: -UNUSED_PARAMETER
+// !DIAGNOSTICS: -UNUSED_PARAMETER, -DEPRECATION
 
-@native
-class A {
+external class A {
     @nativeSetter
     fun set(a: String, v: Any?): Any? = null
 
@@ -35,8 +34,7 @@ class A {
     }
 }
 
-@native
-class B {
+external class B {
     <!WRONG_ANNOTATION_TARGET!>@nativeSetter<!>
     val foo = 0
 
@@ -52,8 +50,7 @@ class B {
     }
 }
 
-@native
-class C {
+external class C {
     <!NATIVE_ANNOTATIONS_ALLOWED_ONLY_ON_MEMBER_OR_EXTENSION_FUN!>@nativeSetter
     fun Int.set(a: String, v: Int)<!> {}