feat: migrations for document auto-sync [AI-141] (#14041)

# Pull Request Template

## Description

Add migrations for document auto-sync

Fixes # (issue)

## Type of change

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

## How Has This Been Tested?
locally

## Checklist:

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

enterprise/app/views/api/v1/models/captain/_assistant_response.json.jbuilder

@@ -29,3 +29,4 @@ json.id resource.id
 json.question resource.question
 json.updated_at resource.updated_at.to_i
 json.status resource.status
+json.edited resource.edited

enterprise/app/views/api/v1/models/captain/_document.json.jbuilder

@@ -11,4 +11,8 @@ json.file_size resource.file_size
 json.id resource.id
 json.name resource.name
 json.status resource.status
+json.sync_status resource.sync_status
+json.last_synced_at resource.last_synced_at&.to_i
+json.last_sync_attempted_at resource.last_sync_attempted_at&.to_i
+json.last_sync_error_code resource.last_sync_error_code
 json.updated_at resource.updated_at.to_i