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/loadJava/compiledKotlin/memberOrder/enumEntries.kt

@@ -1,12 +1,12 @@
 package test
 
 enum class E {
-    ONE
-    TWO
-    THREE
-    FOUR
-    FIVE
-    SIX
-    SEVEN
+    ONE,
+    TWO,
+    THREE,
+    FOUR,
+    FIVE,
+    SIX,
+    SEVEN,
     EIGHT
 }