refs: Mark model_unpickl_compat logs as errors so we see them in sentry
refs: Mark model_unpickl_compat logs as errors so we see them in sentry

It looks like we don't send warnings to sentry for the sentry project. These are low volume and
it'll be helpful to see the stack for these.

beeftornado/sentry,beeftornado/sentry,beeftornado/sentry