[REF] mail: support only model / res_id in mail/view redirection controller

Currently mail/view controller supports either a message_id, either a
model/res_id . Using a message_id is just a shortcut to find its model and
res_id before redirecting to the record view. If the message has been
removed the controller does not work anymore although with model and
res_id it still works while the record exists.

Same functional behavior can be achieved with only model and res_id. Let
us drop support of message_id to lessen code size.

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