Show resolved/unresolved threads in merge request list also when in search list

This issue is a follow up to Show unresolved discussions in MR list (#16813) · Issue · gitlab-org/gitlab

Problem to solve

Show unresolved threads also in the search list /dashboard/merge_requests/search?draft=no&scope=all&state=opened&utf8=✓

Proposal

Include the threads badge in the same way also in the search list view