cleanup: update coverage uploader to v0.3.1 (#9883)
cleanup: update coverage uploader to v0.3.1 (#9883)

Change all the codecov flags to their long versions for improved
readability.  Add "--verbose" for additional logging.  Remove "-q",
which doesn't exist (as far as I can tell from the project repo,
it never did).
googleapis/google-cloud-cpp,googleapis/google-cloud-cpp,googleapis/google-cloud-cpp,googleapis/google-cloud-cpp