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Make Delayed::Worker.new idempotent 

Calling Delayed::Worker.new multiple times would continue to re-add the
plugins to the lifecycle.

Some gems and projects use the pattern `Delayed::Worker.new.work_off` to
trigger delayed jobs in specs. Over time, the callback chain would get
very long and, in our case, caused a StackLevelTooDeep error.

Better would be to have a proper singleton: 

`Delayed::Worker.worker.work_off`

In the absence of a proper singleton, this will make the pattern work.

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