Issue #3442059: Create feature flag module to control navigation top bar visibility

config/install/navigation.settings.yml

config/schema/navigation.schema.yml

css/base/variables.css

css/base/variables.pcss.css

css/components/admin-toolbar-control-bar.css

css/components/admin-toolbar-control-bar.pcss.css

css/components/toolbar-dropdown.css

css/components/toolbar-dropdown.pcss.css

modules/navigation_top_bar/navigation_top_bar.info.yml

modules/navigation_top_bar/navigation_top_bar.module

...s/navigation_top_bar/tests/src/Functional/GenericTest.php

navigation.libraries.yml

navigation.services.yml

src/Form/SettingsForm.php

src/NavigationRenderer.php

templates/navigation.html.twig

templates/top-bar.html.twig

tests/src/Functional/NavigationTopBarTest.php