Make GHA for consistency cancel_redundant_workflow return useful err msg (#55961)
Summary:
This way, the user gets more useful actionable results from the GHA.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55961
Test Plan: CI
Reviewed By: samestep
Differential Revision: D27749013
Pulled By: janeyx99
fbshipit-source-id: bb0edbcdab29ba8ef99005f6fcf52de6782b468d
