Preserve IOutboundParameterTransformer on optional route constraints - #65578

src/Http/Routing/src/Constraints/OptionalOutboundParameterTransformerRouteConstraint.cs(11,102): error CS0246: (NETCORE_ENGINEERING_TELEMETRY=Build) The type or namespace name 'IOutboundParameterTransformer' could not be found (are you missing a using directive or an assembly reference?)

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