Add Windows integration tests showing that subst is handled inconsistently
#25537
| Job | Run time |
|---|---|
| 3m 33s | |
| 1m 59s | |
| 5m 32s |
subst is handled inconsistently
#25537
| Job | Run time |
|---|---|
| 3m 33s | |
| 1m 59s | |
| 5m 32s |