Replace StatusBarRegistry with reactive solution (#4728)

src/extensions/extension-loader/extension-loader.ts

@@ -249,7 +249,6 @@ export class ExtensionLoader {
       const removeItems = [
         registries.GlobalPageRegistry.getInstance().add(extension.globalPages, extension),
         registries.EntitySettingRegistry.getInstance().add(extension.entitySettings),
-        registries.StatusBarRegistry.getInstance().add(extension.statusBarItems),
         registries.CatalogEntityDetailRegistry.getInstance().add(extension.catalogEntityDetailItems),
       ];