Update tooltip for issues related merge request status

- Added relative time to the status
- Changed date format for status date

app/views/projects/issues/_merge_requests_status.html.haml

+- time_format = '%b %e, %Y %l:%M%P %Z%z'
 
 - if merge_request.merged?
   - mr_status_date = merge_request.merged_at
@@ -15,7 +16,7 @@
   - mr_status_icon = 'issue-open-m'
   - mr_status_class = 'open'
 
-- mr_status_tooltip = "<div class=\"bold mb-1\">#{mr_status_title}</div><span class=\"text-tertiary\">#{l(mr_status_date.to_time, format: :timeago_tooltip)}</span>"
+- mr_status_tooltip = "<div class=\"mb-1\"><span class=\"bold\">#{mr_status_title}</span> #{time_ago_in_words(mr_status_date)} ago</div><span class=\"text-tertiary\">#{l(mr_status_date.to_time, format: time_format)}</span>"
 
 %span.suggestion-help-hover{ class: css_class, data: { toggle: 'tooltip', placement: 'bottom', html: 'true', title:  mr_status_tooltip } }
   = sprite_icon(mr_status_icon, size: 16, css_class: "merge-request-status #{mr_status_class}")