[CHIA-1562] move signature validation into run_block_generator()
#23280
| Job | Run time |
|---|---|
| 1s | |
| 7m 1s | |
| 7m 2s |
run_block_generator()
#23280
| Job | Run time |
|---|---|
| 1s | |
| 7m 1s | |
| 7m 2s |