OZG-4381 OZG-4892 replace mail reply option with checkbox

alfa-client/libs/postfach-shared/src/lib/postfach.util.ts

.../lib/postfach-mail-form/postfach-mail-form.component.html

.../lib/postfach-mail-form/postfach-mail-form.component.scss

.../postfach-nachricht-reply-editor-container.component.html

...stfach-nachricht-reply-editor-container.component.spec.ts

...er/postfach-nachricht-reply-editor-container.component.ts

alfa-client/libs/ui/.eslintrc.json

alfa-client/libs/ui/src/index.ts

.../checkbox-enum-editor/checkbox-enum-editor.component.html

.../checkbox-enum-editor/checkbox-enum-editor.component.scss

...eckbox-enum-editor/checkbox-enum-editor.component.spec.ts

...or/checkbox-enum-editor/checkbox-enum-editor.component.ts

...editor/checkbox-enum-editor/checkbox-enum-editor.model.ts

alfa-client/libs/ui/src/lib/ui/ui.module.ts