[Console] Log exit codes as debug messages instead of errors #23827
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Fixes #21003
This patch stops logging
exit_codes != 0
to error and logs it to debug instead, since it's not an error. The console application exited without uncaught exceptions, and the console application deliberately returned a specific exit code, therefore it shouldn't be logged as an error.A valid use case would be to let a caller script in bash (the script spawning the console command) know what action to take based on the exit code. More specifically, exit codes other than 1, 2, 127+n isn't necessarily considered an error.
Monolog is hooked to our mailbox, so we can see what is happening in our production environment. However, it's currently being spammed for no reason because of #21003.