[feature request] Support for posting PR review with no body

[bugale]

Posting a body to the PR review causes a comment to a appear in the PR without any way to remove it after the issues are resolved. Each run leaves another such message, which causes garbage to be accumulated in the PR:

A nice feature would be to add an option to post without body. Then when a new review is added it looks like this:

And when the next run removes the line-comments, no trace is left at all on the PR.