Add UUID parameter to safe parameter names

[zbynek]

With the security hardening for SECURITY-170 as described here https://www.jenkins.io/blog/2016/05/11/security-update/, adding parameters not defined by a job raises a warning. The UUID parameter has a name unique enough that it can't be exploited, by marking it as explicitly safe we can reduce the amount of warnings in Jenkins log related to this parameter.

Testing done

Unit tests passing

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests that demonstrate the feature works or the issue is fixed

[tomasbjerre]

Thanks