[ci] CGO and No CGO being compared in coverage tests

[gdey]

We should either turn off one of them (No CGO has my vote), or figure out how to separate them in coverall api

To disable push of the cover information we just need to remove the --coveralls. To have different coverprofile, we just need to pass in --coverprofile=$name

The easiest thing might be to use the `--coverprofile=default${CGO_ENABLED}" flag to the coverall and that should have different cover profiles?

But this is a bit of a hack.