Lock the backend contract the console relies on after deleting a
campaign: the deleted GID must be gone from the organization's
accessReviewCampaigns connection and node(id:) must return
NOT_FOUND. The frontend caches both queries and would crash again
if either contract slipped (e.g. a stale row, a wrong error code,
or a missing cascade on scope sources).
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
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