Create gitlab job for code format check

Code formatting should be enforced for the CTA repository. One of the components of this strategy is to fail the CI pipeline if the changed code is not compliant with the formatting rules.

This ticket aims to create a GitLab CI job that will run clang-format in check mode and generate an artifact that identifies the lines not formatted according to the rules.

For now, the job will be allowed to fail. This will be changed once we transition to mandatory code formatting.