Add message-sending type to Callback deserialiser

[cdeserranno]

Message callbacks for "message-sending" types are not deserialising into StatusCallback despite being a valid StatusCallbackTypeEnum.

[bwappsec]

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[ckoegel]

Hey! @cdeserranno
Thanks for pointing this out, that file is actually auto-generated from our openapi spec, but we can update that and get a regenerated version with the correct mapping out shortly, I'll tag you when that PR gets opened 👍