Assume longitude is cyclic in `_interp_nominal_lon` #1071

Job	Run time
Build (upstream-dev)	4m 6s
Build (3.8 \| ubuntu-latest)	6m 44s
detect ci trigger	3s
Build (3.9 \| ubuntu-latest)	6m 22s
Build (3.10 \| ubuntu-latest)	6m 23s
Build (cloud-data-tests \| ${{ matrix.variable_id }} \| ${{ matrix.experiment_id }} \| ${{ matrix.grid_label }})	0s
	23m 38s

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