fix(server): separate active subscriptions (#13077)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Bug Fixes**
* Improved accuracy of subscription management by ensuring only active
or trialing subscriptions are considered in all relevant user,
workspace, and license actions.
* Enhanced consistency in subscription retrieval for workspace member
updates and subscription-related operations.

* **Refactor**
* Updated internal subscription retrieval methods to distinguish between
general and active subscriptions for more precise handling across the
app.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/plugins/payment/manager/user.ts

@@ -198,6 +198,15 @@ export class UserSubscriptionManager extends SubscriptionManager {
   }
 
   async getSubscription(args: z.infer<typeof UserSubscriptionIdentity>) {
+    return this.db.subscription.findFirst({
+      where: {
+        targetId: args.userId,
+        plan: args.plan,
+      },
+    });
+  }
+
+  async getActiveSubscription(args: z.infer<typeof UserSubscriptionIdentity>) {
     return this.db.subscription.findFirst({
       where: {
         targetId: args.userId,