feat: use only loop executor for fsspec source
#3010
| Job | Run time |
|---|---|
| 4m 55s | |
| 6m 54s | |
| 2m 44s | |
| 8m 5s | |
| 4m 20s | |
| 7m 29s | |
| 8m 40s | |
| 7m 57s | |
| 7m 21s | |
| 7m 19s | |
| 7m 30s | |
| 6m 6s | |
| 6m 53s | |
| 4m 56s | |
| 3m 33s | |
| 4m 28s | |
| 4m 17s | |
| 3m 53s | |
| 1h 47m 20s |