Return false on aborted enqueue in Active Job
Return false on aborted enqueue in Active Job

In order to prevent a warning:

```
Rails 6.1 will return false when the enqueuing is aborted. Make sure
your code doesn't depend on it returning the instance of the job and set
`config.active_job.return_false_on_aborted_enqueue = true` to remove the
deprecations.
```

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