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/modifiersOnEnumEntry.kt

@@ -14,7 +14,7 @@ enum class E {
     <!WRONG_MODIFIER_TARGET!>final<!> FINAL,
 
     <!WRONG_MODIFIER_TARGET!>inner<!> INNER,
-    <!ENUM_ENTRY_USES_DEPRECATED_OR_NO_DELIMITER!>annotation<!> ANNOTATION,
+    <!WRONG_ANNOTATION_TARGET!>@annotation<!> ANNOTATION,
     <!WRONG_MODIFIER_TARGET!>enum<!> ENUM,
     <!WRONG_MODIFIER_TARGET!>out<!> OUT,
     <!WRONG_MODIFIER_TARGET!>in<!> IN,