Remove Codecov failure override

[samdark]

Removes the explicit codecovFailCiIfError override from the PHPUnit workflow so the shared workflow default is used. Validation: git diff --check.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.29%. Comparing base (7e4fabc) to head (0ab58c9).

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #810   +/-   ##
=========================================
  Coverage     96.29%   96.29%           
  Complexity     1154     1154           
=========================================
  Files           124      124           
  Lines          3540     3540           
=========================================
  Hits           3409     3409           
  Misses          131      131           

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[Copilot]

Pull request overview

This PR removes the explicit codecovFailCiIfError: false override from the GitHub Actions PHPUnit workflow jobs so that the default behavior from the shared yiisoft/actions reusable workflow is applied.

Changes:

• Removed codecovFailCiIfError: false from the phpunit job inputs.
• Removed codecovFailCiIfError: false from the phpunit-without-intl job inputs.

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