UHF-9458: Fix creation of uuid usernames

[hyrsky]

With the new client, preferred_username field in userinfo is set to a UUID. This change removes the preferred_username when it is a UUID so that the name field is used instead.

See: https://git.drupalcode.org/project/openid_connect/-/blob/2.x/src/OpenIDConnect.php?ref_type=heads#L545-559

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9e53539) 72.95% compared to head (c092bc8) 72.95%.

❗ Current head c092bc8 differs from pull request most recent head 45015e4. Consider uploading reports for the commit 45015e4 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #30   +/-   ##
=========================================
  Coverage     72.95%   72.95%           
  Complexity       55       55           
=========================================
  Files             4        4           
  Lines           196      196           
=========================================
  Hits            143      143           
  Misses           53       53           

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