Remove collapse chat item server side endpoints
Remove collapse chat item server side endpoints
Part of https://gitlab.com/gitlab-org/gitter/webapp/issues/1984
Frontend MR, https://gitlab.com/gitlab-org/gitter/webapp/merge_requests/1275
Infra MR, https://gitlab.com/gitlab-com/gl-infra/gitter-infrastructure/merge_requests/79
Todo
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Wait for release with frontend pieces removed to settle and reach production, https://gitlab.com/gitlab-org/gitter/webapp/merge_requests/1277
Edited by Eric Eastwood