feat: captain should be able to access private notes (#11768)

# Pull Request Template

## Linear task: 

https://linear.app/chatwoot/issue/CW-4482/captain-should-be-able-to-access-private-notes-only-on-copilot

## Description

Captain should be able to access private notes (only on copilot)

## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?


![image](https://github.com/user-attachments/assets/b25cf81f-85eb-4adb-a1eb-57e1156b9b9e)


![image](https://github.com/user-attachments/assets/20051b31-cbce-41d9-84d9-13bc71687323)


## Checklist:

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

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

@@ -30,7 +30,7 @@ class Captain::Tools::Copilot::GetConversationService < Captain::Tools::BaseServ
     conversation = Conversation.find_by(display_id: conversation_id, account_id: @assistant.account_id)
     return 'Conversation not found' if conversation.blank?
 
-    conversation.to_llm_text
+    conversation.to_llm_text(include_private_messages: true)
   end
 
   def active?