test: fix test_missing_uid

[bdrung]

Report._get_ignore_dom() calls os.geteuid() instead of os.getuid().

Fix test_missing_uid to mock os.geteuid instead of os.getuid, use MagicMock, and check that the mock was called.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.33%. Comparing base (3c6a27c) to head (82ee0f1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #323      +/-   ##
==========================================
+ Coverage   82.30%   82.33%   +0.02%     
==========================================
  Files          94       94              
  Lines       19289    19288       -1     
  Branches     3105     3106       +1     
==========================================
+ Hits        15876    15880       +4     
+ Misses       2914     2911       -3     
+ Partials      499      497       -2     

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