Rename DAG feature to needs
What does this MR do and why?
This MR removes the usage of "DAG" and "Directed Acyclic Graph" in the docs and UI, instead relying on the needs keyword, which is the key functionality. It still mentions the DAG as an example of the kind of "structure" that you can create by using the needs keyword.
- Related to Consider deprecating the Needs tab DAG visualiz... (#336560)
- Related to Rename and revamp the documentation for the Dir... (#375224 - closed)
- Related to https://gitlab.com/gitlab-org/technical-writing/-/issues/1034
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Edited by Marcel Amirault