This change moves the grid panel UI from the View tab up into the Overlay panel. Reasons to move to the Overlay panel include: - Consistency with the grid options in the 3D viewport - The grid has been drawn as an Overlay for quite some time already Additional changes that now make sense to have: - The grid responds to the main Overlay show/hide toggle - Adds a toggle to show/hide the grid which is consistent with overlays in general As before, these grid controls are only available for active UV edit sessions. Differential Revision: https://developer.blender.org/D11862