revert_graph view unnecessarily serializes the graph

[jacobtylerwalls]

dev/8.0.x
Graph Designer:

1. Move a node in the sidebar, this issues a POST and exposes a Revert Graph button
2. Click Revert Graph

Result: some slowness for larger graphs

---

We serialize the graph here when returning a response...

arches/arches/app/views/graph.py

Lines 696 to 703 in 8ed87f3

	return JSONResponse(
	{
	"graph": editable_future_graph,
	"title": _("Success!"),
	"message": _(
	"The graph has been updated. Please click the OK button to reload the page."
	),
	}

...but we don't use it because we immediately reload the page:

arches/arches/app/media/js/views/graph-designer.js

Line 259 in 8ed87f3

if (status === 'success') { window.location.reload(); }

Suggest we not serialize the graph if we don't plan to use it, and also adjust the response message to not refer to clicking an OK button, as that's not the experience.