Wrong error when trying to release a devmode snap to stable
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Issue body
From the snapcraft UX document, the error to display should be:
Cannot release a devmode snap in the stable channel. Try --beta or --edge
See https://snapcraft.io/doc/confinement/ to make your package safe.
The error we are displaying is:
Revision 2 (devmode) cannot target a stable channel (stable)
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