Converts BackedEnum to string in EventFilterService
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3578056. --> Reported by: [gxleano](https://www.drupal.org/user/3591999) Related to !6 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>The flowdrop_trigger module's event type plugin definitions can return a BackedEnum for the "category" key (this is common in Drupal 11 plugins using PHP 8.1+ enums). When sprintf receives a BackedEnum object instead of a string, PHP throws a fatal error because enums can't be implicitly cast to string.</p> <p>So, any trigger event whose plugin definition uses an enum for category would crash when getCategoryConfigName() is called.</p>
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