Interconnect plugin assumes netlist to be omegaconf or something similar instead of dict

[nikosavola]

Describe the bug
In the interconnect plugin, we seem to assume the netlist structure is something else than what it really is.
At least to me netlist seems to be just a dict for which these attributes don't exist.

These lines try to access .x and .y which don't exist

gplugins/gplugins/lumerical/interconnect.py

Lines 173 to 176 in 4d9459d

	loc = (
	component_distance_scaling_x * placements[instance].x,
	component_distance_scaling_y * placements[instance].y,
	)

This appears something that would be catched with gdsfactory/gdsfactory#2080 easily.

[nikosavola]

Same for the line here

gplugins/gplugins/lumerical/interconnect.py

Line 84 in 4d9459d

info = instance.info.copy()

[joamatab]

yes, it would be great to add some tests for it

@thomasdorch

[github-actions]

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