add optional reason query parameter to submission edit route

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Dan requested a way to not require a user to have to enter the submission edit / archive reason when arriving at the submission edit route via link (as introduced by #305 (closed)). This MR adds an optional reason query parameter to the /surveys/:surveyId/submissions/:submissionId/edit route, that when present and contains a valid reason, will set the archivedReason on the submission automatically, and skip prompting the user for the reason.