[RFC] diff: add diff.<driver>.process for external hunk providers
#27983
| Job | Run time |
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| 4m 38s | |
| 2m 54s | |
| 3m 37s | |
| 4m 25s | |
| 3m 15s | |
| 1m 28s | |
| 4m 21s | |
| 4m 21s | |
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| 4m 20s | |
| 20s | |
| -1s | |
| 3m 6s | |
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| 4m 21s | |
| 4m 22s | |
| 3m 46s | |
| 3m 38s | |
| 1m 7s | |
| 4m 22s | |
| 1m 0s | |
| 41s | |
| 1m 5s | |
| 1m 11s | |
| -1s | |
| 0s | |
| 0s | |
| 1h 11m 8s |