Pipeline shows commit authored date as triggered date

In in app/views/projects/pipelines/_info.html.haml we use commit authored date and display it as Pipeline #6782973 triggered 4 months ago. This can be confusing, especially when commit was amended and pushed later.

This bug is related to https://gitlab.com/gitlab-org/gitlab-ce/issues/28096

%strong Pipeline ##{@commit.pipelines.last.id}
triggered #{time_ago_with_tooltip(@commit.authored_date)} by

Example commit: https://gitlab.com/gitlab-org/gitlab-ce/commit/11dd33a6041eeb7244d94f0356cbb07e1d3ce010

Corresponding pipeline: https://gitlab.com/gitlab-org/gitlab-ce/pipelines/6782973