Verbose pr with native-image-pr-reports

[Mrflatt]

We are using this action to build our kotlin projects to native-image and have seen one issue. When working on a pull request for sometime and using native-image-pr-reports, pull request will have multiple build report comments (possible another comments, code scanning, pr reviews, etc.). It makes harder for pr reviewers to follow what's happening and seeing other reviewers comments.

It would be nice to have option something like native-image-merge-pr-reports, which updates old comment body.

I will open pr related to issue, which adds native-image-merge-pr-reports option to action.