magefile: added combined test coverage support for mage test:all
#8273
| Job | Run time |
|---|---|
| 3m 21s | |
| 1m 5s | |
| 1m 33s | |
| 5m 59s |
mage test:all
#8273
| Job | Run time |
|---|---|
| 3m 21s | |
| 1m 5s | |
| 1m 33s | |
| 5m 59s |