Feature request: Comment when all validations pass

[rlh1994]

Not that important, but sometimes it's nice to have a comment even when all tests have passed, to confirm how many were run without having to check the logs.

[GrantBirki]

I think this could be helpful for some use cases but others might find this to be very spammy and add unwanted noise on pull requests. If this feature is to be added, it should be disabled by default and toggled on with comment_on_success: true or something of the sorts

[frottke]

I would love this feature! please consider adding it.