Remove ProspectiveParachainsMode usage in backing subsystem
#9695
| Job | Run time |
|---|---|
| 41s | |
| 1m 5s | |
| 1m 21s | |
| 11m 46s | |
| 12m 9s | |
| 15m 28s | |
| 14m 26s | |
| 10m 51s | |
| 10m 3s | |
| 10m 12s | |
| 10m 1s | |
| 10m 35s | |
| 9m 54s | |
| 10m 12s | |
| 10m 12s | |
| 10m 36s | |
| 8m 34s | |
| 9m 4s | |
| 1s | |
| 2h 47m 11s |