`pipeline list` is no more, it had some very questionable applications
(none to be precise) and was duplicating old `pipeline show` functionality.
We might introduce a different command to assist in listing (e.g. for
shell completion) in the future.
New `dvc dag` replaces `dvc pipeline show` and by-default will show
all pipelines in the project in ASCII (so there is no more --ascii)
and also `--dot` support, just like before. When given a target,
`dvc dag` (in any mode) will show DAG that leads to the target,
skipping the descendants, unless `--full` is specified.
Ruslan Kuprieiev
Guro Bokum