fix: do not set auth-token-user, if username is given

[jkroepke]

What this PR does / why we need it

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

• fixes Non interactive refresh don't work since last version #251

Special notes for your reviewer

Particularly user-facing changes

Checklist

Complete these before marking the PR as ready to review:

• DCO signed
• The PR title has a summary of the changes
• The PR body has a summary to reflect any significant (and particularly user-facing) changes introduced by this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.37%. Comparing base (9158997) to head (4624f41).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #272      +/-   ##
==========================================
+ Coverage   85.32%   85.37%   +0.04%     
==========================================
  Files          47       47              
  Lines        2160     2167       +7     
==========================================
+ Hits         1843     1850       +7     
  Misses        208      208              
  Partials      109      109              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.