6 files declare their use of DestructableInterface in Zircon Profile 8

CacheCollector.php in core/lib/Drupal/Core/Cache/CacheCollector.php

Contains \Drupal\Core\Cache\CacheCollector.

LocaleTranslation.php in core/modules/locale/src/LocaleTranslation.php

Contains \Drupal\locale\LocaleTranslation.

Registry.php in core/lib/Drupal/Core/Theme/Registry.php

Contains \Drupal\Core\Theme\Registry.

RouteBuilder.php in core/lib/Drupal/Core/Routing/RouteBuilder.php

Contains \Drupal\Core\Routing\RouteBuilder.

TestClass.php in core/modules/system/tests/modules/service_provider_test/src/TestClass.php

Contains \Drupal\service_provider_test\TestClass.

ThemeRegistry.php in core/lib/Drupal/Core/Utility/ThemeRegistry.php

Contains \Drupal\Core\Utility\ThemeRegistry.