feat(banners): enable customer banners (#5348)

## About the changes
This feature allows our Enterprise customers to configure banners to be
displayed on their Unleash instance for all their users to see and
interact with. Previously known as "internal message banners".

frontend/src/component/admin/adminRoutes.ts

@@ -77,7 +77,6 @@ export const adminRoutes: INavigationMenuItem[] = [
     {
         path: '/admin/banners',
         title: 'Banners',
-        flag: 'banners',
         menu: { adminSettings: true, mode: ['enterprise'] },
         group: 'instance',
     },

frontend/src/hooks/api/getters/useBanners/useBanners.ts

@@ -3,17 +3,15 @@ import { formatApiPath } from 'utils/formatPath';
 import handleErrorResponses from '../httpErrorResponseHandler';
 import { useConditionalSWR } from '../useConditionalSWR/useConditionalSWR';
 import useUiConfig from '../useUiConfig/useUiConfig';
-import { useUiFlag } from 'hooks/useUiFlag';
 import { IInternalBanner } from 'interfaces/banner';
 
 const ENDPOINT = 'api/admin/banners';
 
 export const useBanners = () => {
     const { isEnterprise } = useUiConfig();
-    const bannersEnabled = useUiFlag('banners');
 
     const { data, error, mutate } = useConditionalSWR(
-        isEnterprise() && bannersEnabled,
+        isEnterprise(),
         { banners: [] },
         formatApiPath(ENDPOINT),
         fetcher,

src/lib/types/experimental.ts

@@ -144,10 +144,6 @@ const flags: IFlags = {
         process.env.UNLEASH_EXPERIMENTAL_USE_LAST_SEEN_REFACTOR,
         false,
     ),
-    banners: parseEnvVarBoolean(
-        process.env.UNLEASH_EXPERIMENTAL_BANNERS,
-        false,
-    ),
     disableEnvsOnRevive: parseEnvVarBoolean(
         process.env.UNLEASH_EXPERIMENTAL_DISABLE_ENVS_ON_REVIVE,
         false,