feat(devgen/templates/commit): add context to commit message template

- New Features:
  - Added `{{ context }}` variable to the commit message template to provide additional context.
- Enhancements:
  - Removed the emoji usage line from the template to simplify the output.
```

devgen/templates/commit/commit_message.j2

@@ -4,8 +4,8 @@ Guidelines:
 - Title line: `<type>(<scope>): <summary>` (scope is `{{ group_name }}` or `root`).
 - Optional body: A short summary of why.
 - Details: Bullet points for `New Features`, `Enhancements`, `Bug Fixes`.
-- {{ "Use emojis (🚀, 🐛)." if use_emoji else "No emojis." }}
 - Output ONLY the message itself, without any labels like "Title:" or "Format:".
 
 Diff for `{{ group_name }}`:
 {{ diff_text }}
+{{ context }}