[MM-32626] Disable notices for migrations test helper (#17058)

* app/server: make initial product notice fetch blocking

* disable notices on migrations_test helper

migrations/helper_test.go

@@ -32,6 +32,11 @@ func setupTestHelper(enterprise bool) *TestHelper {
 	store.DropAllTables()
 
 	memoryStore := config.NewTestMemoryStore()
+	newConfig := memoryStore.Get().Clone()
+	*newConfig.AnnouncementSettings.AdminNoticesEnabled = false
+	*newConfig.AnnouncementSettings.UserNoticesEnabled = false
+	memoryStore.Set(newConfig)
+
 	var options []app.Option
 	options = append(options, app.ConfigStore(memoryStore))
 	options = append(options, app.StoreOverride(mainHelper.Store))