Fix: flaky garbage collection tests by running GC immediately on start #776
| Job | Run time | 
|---|---|
| 2m 24s | |
| 2m 32s | |
| 4m 57s | |
| 4m 20s | |
| 4m 42s | |
| 7m 18s | |
| 5m 13s | |
| 6m 11s | |
| 6m 24s | |
| 5m 46s | |
| 6m 32s | |
| 6m 5s | |
| 4m 59s | |
| 8m 21s | |
| 6m 13s | |
| 6m 58s | |
| 6m 19s | |
| 5m 37s | |
| 6m 35s | |
| 5m 29s | |
| 8m 23s | |
| 6m 13s | |
| 5m 56s | |
| 8m 32s | |
| 8m 20s | |
| 8m 33s | |
| 5m 8s | |
| 7m 3s | |
| 8m 26s | |
| 2h 59m 29s |