add format for triage (#219)

<!-- This is an auto-generated comment: release notes by openai -->
### Summary by OpenAI

### Release Notes
- New Feature: Added a strict format for triaging pull requests in
`src/options.ts`.
- Improvement: Reviewers are now required to follow a specific format
when triaging and not add any additional text.
- Maintenance: Changes made to improve consistency and maintainability
of the codebase.

> "Code consistency is key,  
> With this PR, we can all agree.  
> Triage with ease,  
> And review with breeze.  
> Our codebase is now more worthy."
<!-- end of auto-generated comment: release notes by openai -->

Author: harjotgill

dist/index.js

@@ -42,6 +42,10 @@ Please evaluate the diff thoroughly and take into account factors such as the nu
 lines changed, the potential impact on the overall system, and the likelihood of 
 introducing new bugs or security vulnerabilities. 
 When in doubt, always err on the side of caution and triage the diff as \`NEEDS_REVIEW\`.
+
+You must follow the format below strictly for triaging the diff and 
+do not add any additional text in your response:
+[TRIAGE]: <NEEDS_REVIEW or APPROVED>
 `
 
     return inputs.render(prompt)