collab: Use billing_customers.has_overdue_invoices to gate subscription access (#24240)

This PR updates the check that prevents subscribing with overdue
subscriptions to use the `billing_customers.has_overdue_invoices` field
instead.

This will allow us to set the value of `has_overdue_invoices` to `false`
when the invoices have been paid.

Release Notes:

- N/A

crates/collab/src/db/queries/billing_subscriptions.rs

@@ -170,40 +170,4 @@ impl Database {
         })
         .await
     }
-
-    /// Returns whether the user has any overdue billing subscriptions.
-    pub async fn has_overdue_billing_subscriptions(&self, user_id: UserId) -> Result<bool> {
-        Ok(self.count_overdue_billing_subscriptions(user_id).await? > 0)
-    }
-
-    /// Returns the count of the overdue billing subscriptions for the user with the specified ID.
-    ///
-    /// This includes subscriptions:
-    /// - Whose status is `past_due`
-    /// - Whose status is `canceled` and the cancellation reason is `payment_failed`
-    pub async fn count_overdue_billing_subscriptions(&self, user_id: UserId) -> Result<usize> {
-        self.transaction(|tx| async move {
-            let past_due = billing_subscription::Column::StripeSubscriptionStatus
-                .eq(StripeSubscriptionStatus::PastDue);
-            let payment_failed = billing_subscription::Column::StripeSubscriptionStatus
-                .eq(StripeSubscriptionStatus::Canceled)
-                .and(
-                    billing_subscription::Column::StripeCancellationReason
-                        .eq(StripeCancellationReason::PaymentFailed),
-                );
-
-            let count = billing_subscription::Entity::find()
-                .inner_join(billing_customer::Entity)
-                .filter(
-                    billing_customer::Column::UserId
-                        .eq(user_id)
-                        .and(past_due.or(payment_failed)),
-                )
-                .count(&*tx)
-                .await?;
-
-            Ok(count as usize)
-        })
-        .await
-    }
 }