Summary:
In the future, it may be helpful to capture some output to display in the
formula editor (e.g. the result of calling print()), but for now it's best
to redirect stdout/stderr to avoid excessive logging.
Test Plan: Tested manually.
Reviewers: alexmojaki
Reviewed By: alexmojaki
Subscribers: alexmojaki
Differential Revision: https://phab.getgrist.com/D3919
