[Archery] should not return non-zero in benchmark diff sub command on regression #21990
Description
When a regression is detected, but the command ran successfully, it should return zero. Currently it returns the number of regression. This is to play better with ursabot. It should be left to the user to decide what to do with the json data.
Reporter: Francois Saint-Jacques / @fsaintjacques
Assignee: Francois Saint-Jacques / @fsaintjacques
PRs and other links:
Note: This issue was originally created as ARROW-5544. Please see the migration documentation for further details.