Add tests for associative and indexed array arguments when rescheduling a cron event

[johnbillion]

Trac ticket: https://core.trac.wordpress.org/ticket/57271

I had a suspicion that using an associative array for the args for a cron event (despite not technically being allowed, they do work) was a cause of the rescheduling failures reported in #57271. It looks like that's not the case, but here are some tests anyway.

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[johnbillion]

https://core.trac.wordpress.org/changeset/58109

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