6 files declare their use of ComponentNotFoundException

ComponentLoader.php in core/lib/Drupal/Core/Template/Loader/ComponentLoader.php
ComponentNodeVisitor.php in core/lib/Drupal/Core/Template/ComponentNodeVisitor.php
ComponentPluginManager.php in core/lib/Drupal/Core/Theme/ComponentPluginManager.php
ComponentPluginManagerTest.php in core/modules/sdc/tests/src/Kernel/ComponentPluginManagerTest.php
ComponentPluginManagerTest.php in core/tests/Drupal/Tests/Core/Theme/Component/ComponentPluginManagerTest.php
ComponentsTwigExtension.php in core/lib/Drupal/Core/Template/ComponentsTwigExtension.php

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