Add `should-skip-ci` step in `ci.yaml` #2168

Job	Run time
should skip ci	5s
cache-pixi-lock / Pixi lock	11s
Unit tests: ubuntu \| pixi run -e test tests	2m 45s
Unit tests: windows \| pixi run -e test tests	8m 37s
Unit tests: ubuntu \| pixi run -e test-py311 tests	4m 9s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
Unit tests: ubuntu \| pixi run -e test-py313 tests	3m 44s
Unit tests: ubuntu \| pixi run -e test-minimum tests	3m 45s
TypeChecking: pixi run typing	0s
merge-test-artifacts	0s
	23m 16s

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