Add DelinquentSince to Subscription fields (#20655)

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/cloud.go

@@ -140,20 +140,21 @@ type PaymentMethod struct {
 
 // Subscription model represents a subscription on the system.
 type Subscription struct {
-	ID          string   `json:"id"`
-	CustomerID  string   `json:"customer_id"`
-	ProductID   string   `json:"product_id"`
-	AddOns      []string `json:"add_ons"`
-	StartAt     int64    `json:"start_at"`
-	EndAt       int64    `json:"end_at"`
-	CreateAt    int64    `json:"create_at"`
-	Seats       int      `json:"seats"`
-	Status      string   `json:"status"`
-	DNS         string   `json:"dns"`
-	IsPaidTier  string   `json:"is_paid_tier"`
-	LastInvoice *Invoice `json:"last_invoice"`
-	IsFreeTrial string   `json:"is_free_trial"`
-	TrialEndAt  int64    `json:"trial_end_at"`
+	ID              string   `json:"id"`
+	CustomerID      string   `json:"customer_id"`
+	ProductID       string   `json:"product_id"`
+	AddOns          []string `json:"add_ons"`
+	StartAt         int64    `json:"start_at"`
+	EndAt           int64    `json:"end_at"`
+	CreateAt        int64    `json:"create_at"`
+	Seats           int      `json:"seats"`
+	Status          string   `json:"status"`
+	DNS             string   `json:"dns"`
+	IsPaidTier      string   `json:"is_paid_tier"`
+	LastInvoice     *Invoice `json:"last_invoice"`
+	IsFreeTrial     string   `json:"is_free_trial"`
+	TrialEndAt      int64    `json:"trial_end_at"`
+	DelinquentSince *int64   `json:"delinquent_since"`
 }
 
 // GetWorkSpaceNameFromDNS returns the work space name. For example from test.mattermost.cloud.com, it returns test