This change updates the text of the pipeline widget that appears on the
merge request page. The text has been made more consistent between
different types of pipelines; this makes the front-end implementation
simpler and more maintainable.  In addition, the type of pipeline is
(i.e. regular pipeline, merge request pipeline, detached pipeline)
included in the text, making this type more obvious to the end user.

Some information has been removed from the widget as part of this
change; however, any information that was removed already appears
elsewhere on the merge request page.