`SpanV2Status` and other custom enums not cleaned up by `RemoveOther` processor

[Dav1dde]

SpanV2Status but also other enums which contain a custom Other for forward compatibility is not cleaned up by the RemoveOther processor, allowing arbitrary strings to make it through end 2 end.

The derive macro should support these enums (if it doesn't already) and these enums should be correctly cleaned up by the RemoveOther processor.

[linear[bot]]

RELAY-172