make group-check more verbose

[Borda]

🚀 Feature

Can we make the probot sending comment similar to codecov in the sense when each check finish, comment on the pr and when the next check finish, update the past comment or remove it and send a new one?

Motivation

The reason is to better communicate to users to understand what is happening as not it is a bit black-box and Will is complaining as well (to be fair) any new contributors would not understand what is happening or what is missing

Pitch

Make developer easier to understand what is happening now...

Alternatives

Additional context

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cc @carmocca @akihironitta @Borda