fix: Email Channel links are not working (backend) (#13898)

# Pull Request Template

## Description

This PR fixes the link formatting issue on the backend by adding
`:autolink` to `ChatwootMarkdownRenderer#render_message`, ensuring all
URLs are converted to `<a>` tags.

Fixes
https://linear.app/chatwoot/issue/CW-6682/email-channel-links-are-not-working

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)


## Checklist:

- [x] My code follows the style guidelines of this project
- [x] 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
- [x] My changes generate no new warnings
- [ ] 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
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Sojan Jose <sojan@pepalo.com>

lib/chatwoot_markdown_renderer.rb

@@ -5,7 +5,7 @@ class ChatwootMarkdownRenderer
 
   def render_message
     markdown_renderer = BaseMarkdownRenderer.new
-    doc = CommonMarker.render_doc(@content, :DEFAULT, [:strikethrough])
+    doc = CommonMarker.render_doc(@content, :DEFAULT, [:strikethrough, :autolink])
     html = markdown_renderer.render(doc)
     render_as_html_safe(html)
   end