[artifact-manager] (#1016) Fix Refresh token push and pull for vra-ng

[GSYankov]

Description

Checklist

• I have added relevant error handling and logging messages to help troubleshooting
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation, relevant usage information (if applicable)
• I have updated the PR title with affected component, related issue number and a short summary of the changes introduced
• I have added labels for implementation kind (kind/) and version type (version/)
• I have tested against live environment, if applicable
• I have synced any structure and/or content vRA-NG improvements with vra-ng and ts-vra-ng archetypes (if applicable)
• I have my changes rebased and squashed to the minimal number of relevant commits. Notice: don't squash all commits
• I have added a descriptive commit message with a short title, including a Fixed #XXX - or Closed #XXX - prefix to auto-close the issue

Testing

Release Notes

Related issues and PRs