Remove Generator in _prune_old_outbound_device_pokes
#3510
| Job | Run time |
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| 34s | |
| 4s | |
| 4s | |
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| 1m 5s | |
| 28s | |
| 40s | |
| 49s | |
| 1m 28s | |
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| 8m 42s | |
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| 22m 2s | |
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| 6m 3s | |
| 8m 33s | |
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| 10m 17s | |
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| 13m 5s | |
| 19m 11s | |
| 2m 11s | |
| 3s | |
| 2h 28m 52s |