Fix: unify device creation and update subscriptions

Unified the GraphQL subscriptions for device creation and updates into
a single subscription that handles both events. Absinthe subscriptions
allow only one top-level field per operation.

Signed-off-by: Osman Hadzic <osman.hadzic@secomind.com>

Author: osmanhadzic

backend/lib/edgehog/devices/device/device.ex

@@ -66,12 +66,8 @@ defmodule Edgehog.Devices.Device do
     subscriptions do
       pubsub EdgehogWeb.Endpoint
 
-      subscribe :device_created do
-        action_types :create
-      end
-
-      subscribe :device_updated do
-        action_types :update
+      subscribe :device_changed do
+        action_types [:create, :update]
       end
     end
   end

frontend/src/api/schema.graphql

@@ -3967,12 +3967,9 @@ type HardwareType implements Node {
   ): HardwareTypePartNumberConnection!
 }
 
-type device_updated_result {
-  updated: Device
-}
-
-type device_created_result {
+type device_changed_result {
   created: Device
+  updated: Device
 }
 
 "The result of the :set_device_led_behavior mutation"
@@ -6520,14 +6517,10 @@ type RootMutationType {
 }
 
 type RootSubscriptionType {
-  deviceCreated(
-    "A filter to limit the results"
-    filter: DeviceFilterInput
-  ): device_created_result
-  deviceUpdated(
+  deviceChanged(
     "A filter to limit the results"
     filter: DeviceFilterInput
-  ): device_updated_result
+  ): device_changed_result
 }
 
 """

frontend/src/components/DevicesTable.tsx

@@ -80,7 +80,7 @@ const DEVICES_TABLE_FRAGMENT = graphql`
 
 const DEVICE_CREATED_SUBSCRIPTION = graphql`
   subscription DevicesTable_deviceCreated_Subscription {
-    deviceCreated {
+    deviceChanged {
       created {
         id
         deviceId
@@ -111,7 +111,7 @@ const DEVICE_CREATED_SUBSCRIPTION = graphql`
 
 const DEVICE_UPDATED_SUBSCRIPTION = graphql`
   subscription DevicesTable_DeviceUpdated_Subscription {
-    deviceUpdated {
+    deviceChanged {
       updated {
         id
         deviceId