Enum deprecated syntax detection implemented and integrated into DeclarationsChecker.

A lot of tests was changed to refactor deprecated syntax. Six new tests were added to check deprecated syntax detection.
Diagnostic for "enum entry uses deprecated super constructor": constructor is highlighted
Diagnostic for "enum entry uses deprecated or no delimiter".
One warning removed.

compiler/testData/diagnostics/tests/modifiers/defaultModifier.kt

@@ -38,8 +38,8 @@ class J {
 }
 
 <!ILLEGAL_MODIFIER!>companion<!> enum class Enum {
-    E1
-    E2
+    E1,
+    E2;
 
     companion object
 }