[JS FE] Prohibit external inline classes

#KT-26138 Fixed

compiler/testData/diagnostics/testsWithJsStdLib/native/inlineClass.kt

@@ -0,0 +1,9 @@
+// !LANGUAGE: +InlineClasses
+
+external inline class <!WRONG_EXTERNAL_DECLARATION!>C(<!EXTERNAL_CLASS_CONSTRUCTOR_PROPERTY_PARAMETER!>val a: Int<!>)<!> {
+    fun foo()
+}
+
+<!WRONG_MODIFIER_TARGET!>inline<!> external enum class <!WRONG_EXTERNAL_DECLARATION!>E<!> {
+    A
+}

compiler/testData/diagnostics/testsWithJsStdLib/native/inlineClass.txt

@@ -0,0 +1,27 @@
+package
+
+public final external inline class C {
+    public constructor C(/*0*/ a: kotlin.Int)
+    public final val a: kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(): kotlin.Unit
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+
+public final external inline enum class E : kotlin.Enum<E> {
+    enum entry A
+
+    private constructor E()
+    public final override /*1*/ /*fake_override*/ val name: kotlin.String
+    public final override /*1*/ /*fake_override*/ val ordinal: kotlin.Int
+    protected final override /*1*/ /*fake_override*/ fun clone(): kotlin.Any
+    public final override /*1*/ /*fake_override*/ fun compareTo(/*0*/ other: E): kotlin.Int
+    public final override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+
+    // Static members
+    public final /*synthesized*/ fun valueOf(/*0*/ value: kotlin.String): E
+    public final /*synthesized*/ fun values(): kotlin.Array<E>
+}