Fix agent startup (#2107)

Task/Issue URL: https://app.asana.com/0/1203581873609357/1206412688037751/f

**Description**:
* Prevents the background agent from starting on waitlist users that did
not start the DBP process
* Disable the agent if the user doesn't have profile data

DuckDuckGo/DBP/DataBrokerProtectionAppEvents.swift

@@ -40,9 +40,17 @@ struct DataBrokerProtectionAppEvents {
 
         Task {
             try? await DataBrokerProtectionWaitlist().redeemDataBrokerProtectionInviteCodeIfAvailable()
+
+            // If we don't have profileQueries it means there's no user profile saved in our DB
+            // In this case, let's disable the agent and delete any left-over data because there's nothing for it to do
+            let profileQueries = await DataBrokerProtectionManager.shared.dataManager.fetchBrokerProfileQueryData(ignoresCache: true)
+            if profileQueries.count > 0 {
+                restartBackgroundAgent(loginItemsManager: loginItemsManager)
+            } else {
+                featureVisibility.disableAndDeleteForWaitlistUsers()
+            }
         }
 
-        restartBackgroundAgent(loginItemsManager: loginItemsManager)
     }
 
     func applicationDidBecomeActive() {