[Futures] Bump log verbosity when ignoring cb errors in python future. (#54476)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54476
Per title. For `add_done_callback`, we log but swallow exceptions in order to keep consistent with what concurrent.futures python library does, see discussion in https://github.com/pytorch/pytorch/pull/45675.
Although, it would be good to improve the verbosity here as this can be a source of confusion if users are setting a different future via `add_done_callback`, and an error is hit resulting in an unexpected hang (see https://github.com/pytorch/pytorch/issues/52132 for more details on how this can happen).
ghstack-source-id: 125300389
Test Plan: CI
Reviewed By: lw
Differential Revision: D27253004
fbshipit-source-id: 72ed21c8fb6d27de5797c17fc46b762f893e6fea
