fix(dynamo-gen): robust DateTime/DateTimeOffset check for [UnixTimest…

[Im5tu]

…amp] filter

Use SpecialType.System_DateTime and a namespace-qualified DateTimeOffset check instead of brittle type.Name comparisons, and only unwrap genuine Nullable (via OriginalDefinition.SpecialType) rather than any generic, so [UnixTimestamp] on List or a custom DateTime type is no longer erroneously accepted. Add nullable DateTime/DateTimeOffset tests.

Checklist

• Tests added/updated and passing (Docker required for integration tests)
• Tested to be compatible with Native AOT compilation
• Documentation updated for new public APIs
• Self-review completed

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