Prohibit to use enum entry as a type

#KT-14179 Fixed

compiler/testData/diagnostics/tests/when/ExhaustiveEnumIs.kt

@@ -4,8 +4,8 @@ enum class MyEnum {
 
 fun foo(x: MyEnum): Int {
     return when (x) {
-        is <!IS_ENUM_ENTRY!>MyEnum.A<!> -> 1
-        is <!IS_ENUM_ENTRY!>MyEnum.B<!> -> 2
-        is <!IS_ENUM_ENTRY!>MyEnum.C<!> -> 3
+        is <!IS_ENUM_ENTRY!>MyEnum.<!ENUM_ENTRY_AS_TYPE!>A<!><!> -> 1
+        is <!IS_ENUM_ENTRY!>MyEnum.<!ENUM_ENTRY_AS_TYPE!>B<!><!> -> 2
+        is <!IS_ENUM_ENTRY!>MyEnum.<!ENUM_ENTRY_AS_TYPE!>C<!><!> -> 3
     }
 }

compiler/testData/diagnostics/tests/when/ExhaustiveEnumMixed.kt

@@ -5,7 +5,7 @@ enum class MyEnum {
 fun foo(x: MyEnum): Int {
     return when (x) {
         MyEnum.A -> 1
-        is <!IS_ENUM_ENTRY!>MyEnum.B<!> -> 2
-        is <!IS_ENUM_ENTRY!>MyEnum.C<!> -> 3
+        is <!IS_ENUM_ENTRY!>MyEnum.<!ENUM_ENTRY_AS_TYPE!>B<!><!> -> 2
+        is <!IS_ENUM_ENTRY!>MyEnum.<!ENUM_ENTRY_AS_TYPE!>C<!><!> -> 3
     }
 }