High label cardinality issue

After a successful deployment of dependency-track-exporter, I start receiving alerts in our infrastructure because the exporter is generating labels with high cardinalities.

It is a known issue when taking into account Prometheus performance as stated in this article [Cardinality is key by Robust Perception](https://www.robustperception.io/cardinality-is-key/)

After a deep investigation, I found that the offender metric is `dependency_track_project_policy_violations` which has a label `uuid` that can explode the number of combinations.

I would suggest dropping the `uuid` label since it doesn't bring benefits in this case as we already have the project name.

Unfortunately, I'm not a good Go developer, but I would be happy to help in any other way.