[AA] Remove KtSymbolWithMembers from KtEnumEntrySymbol

- An enum entry is a variable which doesn't declare any additional
  members. It must not be confused with its implementing anonymous
  object initializer, which may declare additional members, but is an
  implementation detail hidden outside the enum entry's initializer.
  Hence, the enum entry variable should not have a (declared) member
  scope.
- A following commit will add the ability to get the enum entry's
  initializer, so that a member scope for this initializer can be
  obtained (which might be relevant for local analysis).

^KT-61405 fixed

analysis/analysis-api/testData/components/scopeProvider/memberScopeByFqName/emumEntryWithoutMembers.kt

@@ -1,7 +0,0 @@
-package test
-
-enum class E {
-    A
-}
-
-// callable: test/E.A

analysis/analysis-api/testData/components/scopeProvider/memberScopeByFqName/emumEntryWithoutMembers.pretty.txt

@@ -1 +0,0 @@
-NO_SYMBOLS

analysis/analysis-api/testData/components/scopeProvider/memberScopeByFqName/emumEntryWithoutMembers.txt

@@ -1 +0,0 @@
-NO_SYMBOLS