Regression: We can't automatically pack inside large ViaGrid boards

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This is due to us changing from obstacles to static components.

The packing solver doesn't handle complex pcb component polygons like the viagrid board well

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CC @Abse2001 introduced in #1730

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Another cause for this- maybe even the primary cause, is the pcb_vias aren't properly converted inside calculate-packing to pads for the static component.

Yet another issue- since the RP2040 isn't connected to anything, there's literally nothing it's optimizing for. In the absence of any connection, a component maybe should pack the furthest from any pad

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fix for vias tscircuit/calculate-packing#84