[MM 46537]: Feature flag for the new annual subscription toggle (#21551)

model/feature_flags.go

@@ -77,6 +77,8 @@ type FeatureFlags struct {
 
 	PeopleProduct bool
 
+	AnnualSubscription bool
+
 	// A/B Test on reduced onboarding task list item
 	ReduceOnBoardingTaskList bool
 }
@@ -107,6 +109,7 @@ func (f *FeatureFlags) SetDefaults() {
 	f.SendWelcomePost = true
 	f.PostPriority = false
 	f.PeopleProduct = false
+	f.AnnualSubscription = false
 	f.ReduceOnBoardingTaskList = false
 }