Add new diagnostic tests to check new rules for const modifier

compiler/testData/diagnostics/tests/modifiers/const/enumConstName.fir.kt

@@ -0,0 +1,8 @@
+enum class EnumClass {
+    OK, VALUE, anotherValue, WITH_UNDERSCORE
+}
+
+const val name1 = EnumClass.OK.name
+const val name2 = EnumClass.VALUE.name
+const val name3 = EnumClass.anotherValue.name
+const val name4 = EnumClass.WITH_UNDERSCORE.name