Onboarding - use API to add CONAN and JFROG credentials as CI Variables

We should create a utility to add "CI variables" to a namespace or a project repo in Gitlab. 

Once CLOUD-280 is done, we should use the above mentioned utility to add CONAN_USER, CONAN_PASS, JFROG_USER, JFROG_PASS to CI Variable. 

During the onboarding process - after we are done with the "check_project", we should check if the above mentioned items are added to the Gitlab CI? If no, then we should add them. If they are added and are different from what we have with us, we should ask the user if they want to change it? Or create a copy? 

• Master copy of variables are named as: 
  • QTCLOUD_CONAN_USER
  • QTCLOUD_CONAN_PASS
  • QTCLOUD_JFROG_USER
  • QTCLOUD_JFROG_PASS
• Backup copy (in case we have to overwrite existing ones) are named as:
  • QTCLOUD_CONAN_USER_OLD_yyyy_mm_dd
  • QTCLOUD_CONAN_PASS_OLD_yyyy_mm_dd
  • QTCLOUD_JFROG_USER_OLD_yyyy_mm_dd
  • QTCLOUD_JFROG_PASS_OLD_yyyy_mm_dd

Workflow :

• check_credentials - OK
• check_project_access - OK
• TBD in this ticket:
  • get_variables 
  • check_qtcloud_variables_exist
  • if_yes_overwrite_and_create_backup
  • if_no_create_and_add
• We have to use gitlab python library to do this or then, the gitlab REST API to do this.