[Feature]: Flag to force non-zero exit status if any variable failed.

[TonyB9000]

Is your feature request related to a problem?

As e3sm_to_cmip is designed to accept a list of variables to cmorize, the default behavior was to continue onward even if a variable failed, and eventually return a 0 status. This would prevent a calling process from knowing to exit itself when e3sm_to_cmip failed for a cmorizing failure.

At minimum, the app needs to return non-zero if any variable failed, Optionally, a flag to force an exit when any variable failed.

Describe the solution you'd like

One or two optional command line flags:

• error-on-var-failure: Ensure a non-zero status is returned after all variables are processed, if any one of them failed.
• exit-on-var-failure: Force application to exit ASAP when any variable failure is encountered.

Describe alternatives you've considered

No response

Additional context

No response