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

spec/enterprise/controllers/api/v1/accounts/captain/copilot_messages_controller_spec.rb

@@ -44,7 +44,7 @@ RSpec.describe 'Api::V1::Accounts::Captain::CopilotMessagesController', type: :r
         end.to change(CopilotMessage, :count).by(1)
 
         expect(response).to have_http_status(:success)
-        expect(CopilotMessage.last.message).to eq(message_content)
+        expect(CopilotMessage.last.message).to eq({ 'content' => message_content })
         expect(CopilotMessage.last.message_type).to eq('user')
         expect(CopilotMessage.last.copilot_thread_id).to eq(copilot_thread.id)
       end

spec/enterprise/controllers/api/v1/accounts/captain/copilot_threads_controller_spec.rb

@@ -4,6 +4,7 @@ RSpec.describe 'Api::V1::Accounts::Captain::CopilotThreads', type: :request do
   let(:account) { create(:account) }
   let(:admin) { create(:user, account: account, role: :administrator) }
   let(:agent) { create(:user, account: account, role: :agent) }
+  let(:conversation) { create(:conversation, account: account) }
 
   def json_response
     JSON.parse(response.body, symbolize_names: true)
@@ -50,7 +51,7 @@ RSpec.describe 'Api::V1::Accounts::Captain::CopilotThreads', type: :request do
 
   describe 'POST /api/v1/accounts/{account.id}/captain/copilot_threads' do
     let(:assistant) { create(:captain_assistant, account: account) }
-    let(:valid_params) { { message: 'Hello, how can you help me?', assistant_id: assistant.id } }
+    let(:valid_params) { { message: 'Hello, how can you help me?', assistant_id: assistant.id, conversation_id: conversation.display_id } }
 
     context 'when it is an un-authenticated user' do
       it 'returns unauthorized' do
@@ -103,7 +104,7 @@ RSpec.describe 'Api::V1::Accounts::Captain::CopilotThreads', type: :request do
 
           message = thread.copilot_messages.last
           expect(message.message_type).to eq('user')
-          expect(message.message).to eq(valid_params[:message])
+          expect(message.message).to eq({ 'content' => valid_params[:message] })
         end
       end
     end