magefile: added combined test coverage support for mage test:all
#2056
| Job | Run time |
|---|---|
| 5m 19s | |
| 3m 57s | |
| 9m 16s |
mage test:all
#2056
| Job | Run time |
|---|---|
| 5m 19s | |
| 3m 57s | |
| 9m 16s |