Allow `needs` to take `pipeline:` and `job:` which
would define cross pipeline dependency to a particular
pipeline ID.

This allows to narrow down artifacts dependencies to specific
scope and not to the overall project+ref scope which may cause
artifacts to be overridden by concurrent pipelines.

Rename cross_pipeline to cross_project dependencies

In preparation to support actual cross_pipeline dependencies
we need to rename the current cross_pipeline job dependencies
to cross_project as those are specified by project + ref criteria.