[CLD-6537] Cloud Annual Renewals - Banners Implementation (#25267)

* Initial implementation of Cloud Annual Renewal flow - system banners for admins and end users

* Actually add the file

* Add AlertBanner to system console billing_subscriptions page

* Fixes for non-admin banner and pipeline

* Updates to coincide with the CWS side of thigns

* Add a feature flag for the 60 day experience to ensure banners don't show accidentally

* Fix tests

---------

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

server/channels/api4/cloud.go

@@ -96,20 +96,26 @@ func getSubscription(c *Context, w http.ResponseWriter, r *http.Request) {
 			ProductID:       subscription.ProductID,
 			IsFreeTrial:     subscription.IsFreeTrial,
 			TrialEndAt:      subscription.TrialEndAt,
+			EndAt:           subscription.EndAt,
+			CancelAt:        subscription.CancelAt,
+			DelinquentSince: subscription.DelinquentSince,
 			CustomerID:      "",
 			AddOns:          []string{},
 			StartAt:         0,
-			EndAt:           0,
 			CreateAt:        0,
 			Seats:           0,
 			Status:          "",
 			DNS:             "",
 			LastInvoice:     &model.Invoice{},
-			DelinquentSince: subscription.DelinquentSince,
 			BillingType:     "",
 		}
 	}
 
+	if !c.App.Config().FeatureFlags.CloudAnnualRenewals {
+		subscription.WillRenew = ""
+		subscription.CancelAt = nil
+	}
+
 	json, err := json.Marshal(subscription)
 	if err != nil {
 		c.Err = model.NewAppError("Api4.getSubscription", "api.cloud.request_error", nil, "", http.StatusInternalServerError).Wrap(err)

server/channels/api4/cloud_test.go

@@ -154,7 +154,7 @@ func Test_GetSubscription(t *testing.T) {
 		ProductID:       "SomeProductId",
 		AddOns:          []string{},
 		StartAt:         0,
-		EndAt:           0,
+		EndAt:           2000000000,
 		CreateAt:        0,
 		Seats:           0,
 		IsFreeTrial:     "true",