compose: Migrate compose-all-everyone to use compose_banner.

This is part several updates for #22524.

Testing note: I removed the test test_compose_all_everyone_confirm_clicked
since it heavily relies on the old way of rendering banners and is too
UI-focused (instead of logic focused) for me to feel like it's worth
testing that the banner is removed when clicking the button.

static/js/compose_error.ts

@@ -13,6 +13,7 @@ export const CLASSNAMES = {
     // warnings
     topic_resolved: "topic_resolved",
     recipient_not_subscribed: "recipient_not_subscribed",
+    wildcard_warning: "wildcard_warning",
     // errors
     empty_message: "empty_message",
     wildcards_not_allowed: "wildcards_not_allowed",