Issue #3493134 by christian.wiedemann, pdureau: Remove TODOs and obsolete stuff

...rc/Plugin/Field/FieldFormatter/ComponentFormatterBase.php

src/Element/ComponentElementBuilder.php

src/Element/ComponentFormBase.php

src/Form/ComponentFormBuilderTrait.php

templates/ui-patterns-actions.html.twig

...les/ui_patterns_test/components/alert/alert.component.yml

tests/modules/ui_patterns_test/components/alert/alert.twig

...s_test/components/close_button/close_button.component.yml

...i_patterns_test/components/close_button/close_button.twig

...omponents/prop_types_tests/prop_types_tests.component.yml

...ns_test/components/prop_types_tests/prop_types_tests.twig

tests/modules/ui_patterns_test/ui_patterns_test.module

tests/src/Kernel/ComponentPluginManagerTest.php