Drop old enum syntax. Comma / semicolon are now a syntactic part of enum entry.

Comma must present now between enum entries, semicolon between last entry & first member, constructor calls must be without colons / specifiers.
A swarm of tests fixed accordingly.

compiler/testData/diagnostics/tests/enum/interfaceWithEnumKeyword.kt

@@ -1,6 +1,6 @@
 <!WRONG_MODIFIER_TARGET!>enum<!> interface Some {
     // Enum part
-    <!ABSTRACT_MEMBER_NOT_IMPLEMENTED, ENUM_ENTRY_USES_DEPRECATED_OR_NO_DELIMITER!>D<!>
+    <!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>D<!>;
 
     // Interface like part
     fun test()