FEATURE: granular webhooks (#23070)

Before this change, webhooks could be only configured for specific groups like for example, all topic events.

We would like to have more granular control like for example topic_created or topic_destroyed.

Test are failing because plugins changed has to be merged as well:
discourse/discourse-assign#498
discourse/discourse-solved#248
discourse/discourse-topic-voting#159

plugins/chat/config/locales/client.en.yml

@@ -20,9 +20,12 @@ en:
             chat:
               create_message: "Create a chat message in a specified channel."
       web_hooks:
-        chat_message_event:
-          name: "Chat message event"
-          details: "When a chat message is created, edited, trashed or restored."
+        chat_event:
+          group_name: "Chat events"
+          chat_message_created: "Message is created"
+          chat_message_edited: "Message is edited"
+          chat_message_trashed: "Message is trashed"
+          chat_message_restored: "Message is restored"
     about:
       chat_messages_count: "Chat messages"
       chat_channels_count: "Chat channels"

plugins/chat/lib/chat/outgoing_web_hook_extension.rb

@@ -4,7 +4,7 @@ module Chat
   module OutgoingWebHookExtension
     def self.prepended(base)
       def base.enqueue_chat_message_hooks(event, payload, opts = {})
-        if active_web_hooks("chat_message").exists?
+        if active_web_hooks(event).exists?
           WebHook.enqueue_hooks(:chat_message, event, payload: payload, **opts)
         end
       end

plugins/chat/spec/fabricators/outgoing_chat_message_web_hook_fabricator.rb

@@ -1,9 +1,15 @@
 # frozen_string_literal: true
 
 Fabricator(:outgoing_chat_message_web_hook, from: :web_hook) do
-  transient chat_message_hook: WebHookEventType.find_by(name: "chat_message")
-
-  after_build do |web_hook, transients|
-    web_hook.web_hook_event_types = [transients[:chat_message_hook]]
+  after_build do |web_hook|
+    web_hook.web_hook_event_types =
+      WebHookEventType.where(
+        name: %w[
+          chat_message_created
+          chat_message_edited
+          chat_message_trashed
+          chat_message_restored
+        ],
+      )
   end
 end