magefile: added combined test coverage support for mage test:all
#8337
| Job | Run time |
|---|---|
| 3m 19s | |
| 1m 13s | |
| 2m 2s | |
| 6m 34s |
mage test:all
#8337
| Job | Run time |
|---|---|
| 3m 19s | |
| 1m 13s | |
| 2m 2s | |
| 6m 34s |