Fix default authentication of C++ Client

[jt2594838]

The previous default authentication (username and password) in Client-CPP is inconsistent with Client-Java.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 41.04%. Comparing base (7f6211e) to head (03587a9). Report is 8 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13363      +/-   ##
============================================
- Coverage     41.04%   41.04%   -0.01%     
  Complexity       71       71              
============================================
  Files          3945     3945              
  Lines        243561   243561              
  Branches      29471    29471              
============================================
- Hits          99974    99973       -1     
- Misses       143587   143588       +1     

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[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud