feat(graph): add basic "Rearrange" mode for Dag graph view

[TomasCorreia2003]

This feature addresses #55796 by adding a "Rearrange" button which when pressed, allows users to drag and drop nodes when in a DAG's graph view. For this, it adds node collision-avoidance on node drop and real-time edge recalculation to provide users with a responsive and helpful experience. Users cannot control edges as they represent dependencies. We also decided to make any changes while in "Rearrange mode" not persistent as the feature is simply meant to be a viewing aid for confusing graphs such as the ones spawned from complex DAGs.
This will be a great start for anyone attempting to make this mode persistent or any other QoL or functional improvements.

Closes #55796

[boring-cyborg]

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[choo121600]

Could you attach before/after screenshots or a short recording for this UI change?
It would help with the review.

[bbovenzi]

Echoing @choo121600, a GIF would also be very helpful