improve error handling and propagation

[xcoulon]

Returning errors from one layer to another in the code (eg: a repository error returned to a service, etc.) using errors.Wrapf(err, ...) is not sufficient, as the top-level error does not include the whole stacktrace, but just a set of messages attached together.
Having a proper stacktrace for each error is important as errors are collected on Sentry and without the stacktrace, it's hard to determine the location of the "root cause".
On the controller level, however, the error should be wrapped with a message that can be returned to the user (e.g.: "the action could not be performed"), but without passing the whole stacktrace nor the root cause.