EnumHasFlagTranslator should clone SelectExpression when repeating

[smitpatel]

Generated SQL

SELECT [g].[Nickname], [g].[SquadId], [g].[AssignedCityName], [g].[CityOfBirthName], [g].[Discriminator], [g].[FullName], [g].[HasSoulPatch], [g].[LeaderNickname], [g].[LeaderSquadId], [g].[Rank]
FROM [Gears] AS [g]
WHERE ([g].[Rank] & COALESCE((
    SELECT TOP(1) [g1].[Rank]
    FROM [Gears] AS [g1]
    ORDER BY [g1].[Nickname], [g1].[SquadId]), 0)) = COALESCE((
    SELECT TOP(1) [g1].[Rank]
    FROM [Gears] AS [g1]
    ORDER BY [g1].[Nickname], [g1].[SquadId]), 0)

The SelectExpression is visited twice and mutated in place. Current side effect is first visit applies "g0" alias, second one updates to "g1" erasing "g0" from query.

[smitpatel]

For now, I am converting to skip already visited SelectExpression so we don't re-assign new alias. If in future we encounter case where it causes incorrect SQL, we can look into how to resolve it.

[smitpatel]

#26532 will resolve it fully.