Remove DOCKER_HOST override in reports

What does this MR do?

We've been seeing failures in pipelines for code_quality and dependency_scanning from the same reason could not change group /var/run/docker.sock to docker: group docker not found, Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Since we use docker-in-docker, we shouldn't override the DOCKER_HOST variable which by default uses tcp://docker:2375

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content