4 string references to plugin.manager.action

ActionAdminManageForm::create in core/modules/action/src/Form/ActionAdminManageForm.php
ActionListBuilder::createInstance in core/modules/action/src/ActionListBuilder.php
EmailActionTest::testEmailAction in core/tests/Drupal/KernelTests/Core/Action/EmailActionTest.php: Tests the email action plugin.
PluginExistsConstraintValidatorTest::testValidation in core/tests/Drupal/KernelTests/Core/Plugin/PluginExistsConstraintValidatorTest.php: Tests validation of plugin existence.

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