Group resolved discussions horizontally to reduce vertical space

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What

Reduce space taken up by resolved discussions by grouping them in one line.

E.g. 7 discussions took place: [Avatar] [Avatar] [Avatar] [Avatar] [Avatar] [Avatar] [Avatar]

Why

When trying to get an overview of an issue it is useful to see that discussions took place, but intrusive to have to scroll past 15 of them followed by 9 more from a later review.

Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/34814#note_34422478