Avoid redundant {channel,node}_announcement signature checks
#15337
| Job | Run time |
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| 2m 41s | |
| 2m 18s | |
| 33m 2s | |
| 6m 14s | |
| 1h 34m 19s | |
| 1h 8m 20s | |
| 31m 10s | |
| 1h 3m 59s | |
| 1h 24m 45s | |
| 1m 8s | |
| 1h 11m 24s | |
| 15s | |
| 1h 7m 33s | |
| 6h 0m 7s | |
| 55m 58s | |
| 50m 26s | |
| 1h 33m 5s | |
| 18h 6m 44s |