Remove old jobOption so we always uses the new one in CI tests

Stewart Martin-Haughrequested to merge
smh/athena:remove_old_jO into master

newJO test uses get_files to pick up the pickle generating jO. However, if it's already run in the same directory then it will not pick up a new file. This could get us into trouble in the CI - I think this may affect !21659 (merged).

Cheers,

Stewart

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