Gemini review fix (#342)

* Refactor review.js for better error handling and updates

Refactor review.js to improve error handling, update model version, and enhance comments.

* Update gemini-pr-review.yml

* updated the script

* Improve error handling and AI prompts in review.js

Enhance error handling in fetchWithBackoff function and update comments for clarity. Adjust prompts for AI code review and remediation recommendations to improve structure and detail.

* Add GitHub Actions workflow for issue summarization

Author: vibhutikumar07