Use date from the past to ensure timeago rendering absolute value
What does this MR do?
Fix failing Karma test for ee/spec/javascripts/issuable/related_issues/components/issue_item_spec.js
where using current date led to timeago
rendering contextual day instead of absolute value, leading to Karma starting to fail on master
as we approach to said mock date.
Related Issue
Closes #8985 (closed)