Add MR context for commits in environment deploys and pipelines
Due to performance issues mentioned https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6691#note_16583839 this is delayed. This issue is to get these in at a slightly later time.
In the environment list (original issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/22774):
This also affects the pipeline list :
In the pipeline list (original issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/19991):