PRTriage should only be triggered by commit not comment

[sotayamashita]

Summary

Steps to reproduce

1. Merge PR
2. Comment

Pull Request URL

N/A

What is the current bug behavior?

PRTriage remove PR: Merged if user comment.

What is the expected correct behavior?

PRTriage should only check commit

Relevant logs and/or screenshots

Possible fixes

(If you have any idea to solve the problem, please help us.)

[iashok22]

Can we use synchronized instead of edited?