Issue #3477287 by just_like_good_vibes: Rename MachineName to Identifier

...theme_test/components/all_errors/all_errors.component.yml

...ns_devel_theme_test/components/all_errors/all_errors.twig

modules/ui_patterns_legacy/src/PropConverter.php

src/Plugin/UiPatterns/PropType/IdentifierPropType.php

src/Plugin/UiPatterns/PropType/StringPropType.php

src/Plugin/UiPatterns/Source/TextfieldWidget.php

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

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

...st/components/test-component/test-component.component.yml

...tterns_test/components/test-component/test-component.twig