fix: Update specs, add background response job implementation for copilot threads (#11600)

- Enable jobs by default when a copilot thread or a message is created.
- Rename thread_id to copilot_thread_id to keep it consistent with the
model name
- Add a spec for search_linear_issues service

enterprise/app/services/captain/copilot/chat_service.rb

@@ -51,7 +51,7 @@ class Captain::Copilot::ChatService < Llm::BaseOpenAiService
       "#{self.class.name} Assistant: #{@assistant.id}, Previous History: #{config[:previous_history]&.length || 0}, Language: #{config[:language]}"
     )
 
-    @copilot_thread = @account.copilot_threads.find_by(id: config[:thread_id]) if config[:thread_id].present?
+    @copilot_thread = @account.copilot_threads.find_by(id: config[:copilot_thread_id]) if config[:copilot_thread_id].present?
     @previous_history = if @copilot_thread.present?
                           @copilot_thread.previous_history
                         else

enterprise/app/services/captain/tools/copilot/search_linear_issues_service.rb

@@ -46,7 +46,7 @@ class Captain::Tools::Copilot::SearchLinearIssuesService < Captain::Tools::BaseS
   end
 
   def active?
-    @user.present? && @assistant.account.hooks.find_by(app_id: 'linear').present?
+    @user.present? && @assistant.account.hooks.exists?(app_id: 'linear')
   end
 
   private