Output: duplicate DiagoAssist/DiagoIterAssist TIME output

### Describe the bug

In the log `TIME STATISTICS`, two different entries are displayed like:
```bash
 DiagoIterAssist diag_subspace     0.34   20       0.02   24.35  
...
 DiagoAssist     diag_subspace     0.34   20       0.02   24.22  
```
Theses are actually a pair of timer ticks at the start and end of DiagoIterAssist::diag_subspace.
