test(native): add stack overflow integration coverage

[jpnurmi]

Stack overflows were already handled by the normal SEH/UEF path before introducing the WER module, but there was no dedicated integration test for it, as other backends have:

• test_inproc_stack_overflow_stdout
• test_breakpad_stack_overflow_stdout
• test_crashpad_dumping_stack_overflow

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.78%. Comparing base (b5cd30f) to head (b07db43).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1913      +/-   ##
==========================================
+ Coverage   75.71%   75.78%   +0.07%     
==========================================
  Files          93       93              
  Lines       22034    22034              
  Branches     3925     3925              
==========================================
+ Hits        16682    16698      +16     
+ Misses       4464     4456       -8     
+ Partials      888      880       -8     

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