Change exception as this is allowed to be retried

[vmcj]

The BadRequest implies that the request should not be repeated but as this is most likely a temporary problem we should encourage agents to get back.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: webapp/src/Controller/Jury/SubmissionController.php

Function	Unhandled Issue
App\Controller\Jury\SubmissionController::teamOutputAction	Symfony\Component\HttpKernel\Exception\BadRequestHttpException: No team output available (yet). /src/Controller/Jury/SubmissionController.php in App\Control... Event Count: 1

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