CI stages in pipeline list should aligned centered

Continues conversation from: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6338#note_15904005

CI stages in pipeline list should aligned centered. Currently it would look funny but that's because the "commit" cell has a wrong width setting to it:

image

If corrected it would look like:

image

cc: @markpundsack @tauriedavis @annabeldunstone

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