Silence deprecations in PHPUnit tests
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3540074. --> Reported by: [phenaproxima](https://www.drupal.org/user/205645) Related to !585 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>We have many contrib dependencies with many deprecated code paths. These cause thousands of deprecation warnings when we run PHPUnit tests and make test failures much harder, nearly impossible, to debug. There nothing we can do about the deprecations in our dependencies, so we should just silence them.</p>
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