Dev 12 a

• added gitlab client class
• added methods for gitlab users and groups
• developed unit tests
  • pipeline green https://code.il2.dso.mil/platform-one/products/valkyrie/valkyrie-api/-/pipelines/184673
• developed integration tests
• updated documentation in info kiosk with regard to running big bang
  • https://repo1.dso.mil/platform-one/party-bus/valkyrie/info-kiosk/-/blob/master/dev/local_dev_env.md