fix(csharp): emit required for non-optional arrays of scalar and enum types

[muhabdulkadir]

Closes #

shouldEmitRequired() checked isScalarAlias and isEnum before isArray, causing it to return false for non-optional arrays of scalar types (e.g. UUID[]) and enum types (e.g. Status[]). In C#, arrays are always reference types; even Guid[] or Status[], and should receive the required modifier when useRequiredForNonOptionalReferenceTypes is enabled.

Author Checklist

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• Merging to main from fork:branchname