Fix approved domains validation for alerts and dashboard subscriptions (#18049)

...abase_enterprise/advanced_config/models/pulse_channel.clj

frontend/src/metabase/components/form/FormMessage.jsx

frontend/src/metabase/dashboard/components/Sidebar.jsx

...tend/src/metabase/dashboard/components/Sidebar.styled.jsx

frontend/src/metabase/query_builder/actions.js

...end/src/metabase/query_builder/components/AlertModals.jsx

.../metabase/query_builder/components/AlertModals.styled.jsx

...nd/src/metabase/query_builder/containers/QueryBuilder.jsx

frontend/src/metabase/sharing/components/AddEditSidebar.jsx

frontend/src/metabase/sharing/components/SharingSidebar.jsx