fix: Restore send as external message when payload is big #6310
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This will make sure that sending a large message to many devices will not generate a huge payload to encrypt and send to backend.
In this case, an
externalmessage is sent (basically there is 1 encrypted payload and each client only gets a encrypted decryption key for that huge payload)This feature was killed when the non-qualified message sending abilities were sunset (see #4927).
This PR ports back the external message feature back to the fully qualified message sending.