Snyk is now being used for code analysis in favor of Sonarqube. This
commit drops Sonarqube. Schutzbot was only neccessary for running
SonarQube, so it has also been dropped.
This adds the ability to use our Schutzbot Gitlab CI and run Sonarqube
scan there. We have pretty much the exact same thing in weldr-client
repo and use it only for Sonarqube. This could also be used in the
future if there is any need to use our own CI.
The added scan is just informative and is by no means supposed to be
used to gate PRs, there will be just one more link to
check the results in case anyone is interested.
