Fix: flaky garbage collection tests by running GC immediately on start #779
| Job | Run time | 
|---|---|
| 2m 35s | |
| 4m 31s | |
| 2m 24s | |
| 4m 25s | |
| 4m 34s | |
| 4m 58s | |
| 6m 56s | |
| 5m 43s | |
| 6m 17s | |
| 8m 31s | |
| 8m 31s | |
| 6m 34s | |
| 6m 19s | |
| 5m 43s | |
| 5m 24s | |
| 8m 54s | |
| 8m 24s | |
| 6m 21s | |
| 6m 48s | |
| 8m 57s | |
| 6m 18s | |
| 6m 2s | |
| 5m 43s | |
| 5m 59s | |
| 8m 25s | |
| 7m 8s | |
| 6m 41s | |
| 5m 15s | |
| 6m 11s | |
| 3h 0m 31s |