Generic error messages for task failures

[annehaley]

We should avoid exposing specific error messages to the user unless it is an input validation error. Our tasks are currently wrapped in try-catch blocks which save str(e) as the error message which will be shown to the user. This could be a security risk.

[annehaley]

Use logging.exception in the except block so that Sentry will be able to capture the error, too.
https://docs.sentry.io/product/sentry-basics/integrate-backend/capturing-errors/#handled-errors
https://docs.sentry.io/platforms/python/integrations/logging/#behavior