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/redeclarations/SingletonAndFunctionSameName.kt

@@ -11,9 +11,9 @@ object Foo {
 <!CONFLICTING_OVERLOADS!>fun En()<!> = 239
 
 enum class <!CONFLICTING_OVERLOADS!>En<!> {
-    ENTRY
+    ENTRY,
 
-    SUBCLASS { }
+    SUBCLASS { };
 
     fun ENTRY() = 42