nx-cugraph: add ancestors and descendants
#3604
| Job | Run time |
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| 37s | |
| 51m 43s | |
| 50m 29s | |
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| 34m 7s | |
| 33m 47s | |
| 1h 19m 54s | |
| 22m 24s | |
| 49m 54s | |
| 1h 14m 0s | |
| 53m 41s | |
| 55m 54s | |
| 13m 51s | |
| 13m 41s | |
| 53m 48s | |
| 56m 6s | |
| 2s | |
| 2s | |
| 20m 49s | |
| 19m 24s | |
| 20m 21s | |
| 1s | |
| 27m 37s | |
| 26m 43s | |
| 27m 37s | |
| 27m 33s | |
| 24m 47s | |
| 24m 6s | |
| 24m 22s | |
| 24m 44s | |
| 3s | |
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| 15h 14m 1s |