Add shards to valid_encodings to enable sharded Zarr writing
#15999
| Job | Run time |
|---|---|
| 3s | |
| 3s | |
| 9m 21s | |
| 11m 12s | |
| 4m 56s | |
| 7m 44s | |
| 16m 43s | |
| 19m 15s | |
| 1m 39s | |
| 7m 31s | |
| 9m 7s | |
| 6m 32s | |
| 1m 45s | |
| 1h 35m 51s |