Add Windows integration tests showing that subst is handled inconsistently
#6070
| Job | Run time |
|---|---|
| 1m 8s | |
| 3m 0s | |
| 1m 13s | |
| 5m 21s |
subst is handled inconsistently
#6070
| Job | Run time |
|---|---|
| 1m 8s | |
| 3m 0s | |
| 1m 13s | |
| 5m 21s |