Enable test coverage visualization on runner project
In 12.9 GitLab released the Test Coverage Visualization feature.
This enables seeing test coverage information inside the file diff view of MRs.
It would be great to enable this for the runner project (currently the feature is feature-flagged off by default).
On top of the feature flag, we also need to convert our test coverage output from the standard
go test coverage report to a
cobertura formatted report. There is a tool available at https://github.com/t-yuki/gocover-cobertura which does such a conversion.