[Core][MPI] Improve GatherModelPartUtility adding entities at the end
#20906
| Job | Run time |
|---|---|
| 24m 15s | |
| 20m 52s | |
| 16s | |
| 19m 38s | |
| 48m 37s | |
| 18m 28s | |
| 1h 32m 37s | |
| 1h 21m 23s | |
| 1h 23m 42s | |
| 1h 37m 7s | |
| 1h 26m 58s | |
| 9h 33m 53s |