[MM-52158] - Don't show deprecation/move to annual banners to some clients (#22963)

* [MM-52158] - Don't show deprecation/move to annual banners to some clients

* create const

* feedback impl

* update test names

* update banner text

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/api4/cloud.go

@@ -103,6 +103,7 @@ func getSubscription(c *Context, w http.ResponseWriter, r *http.Request) {
 			DNS:             "",
 			LastInvoice:     &model.Invoice{},
 			DelinquentSince: subscription.DelinquentSince,
+			BillingType:     "",
 		}
 	}