Update `_validate_against_pure_literal` to fail on Xarray objects #2316

Job	Run time
should run ci	6s
cache-pixi-lock	1m 30s
build-and-upload-nightly-parcels	1m 31s
Unit tests: windows \| pixi run -e test tests	6m 27s
Unit tests: ubuntu \| pixi run -e test-py311 tests	4m 8s
Unit tests: ubuntu \| pixi run -e test tests	3m 22s
Unit tests: ubuntu \| pixi run -e test-py313 tests	3m 51s
Unit tests: ubuntu \| pixi run -e test-minimum tests	4m 1s
TypeChecking: pixi run typing	0s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
merge-test-artifacts	0s
	24m 56s

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