DOC: Add descriptions to the Pixi tasks #2263

Job	Run time
should run ci	8s
cache-pixi-lock	2m 16s
Unit tests: ubuntu \| pixi run -e test-minimum tests	4m 14s
Unit tests: windows \| pixi run -e test tests	6m 26s
Unit tests: ubuntu \| pixi run -e test-py313 tests	4m 12s
Unit tests: ubuntu \| pixi run -e test-py311 tests	4m 1s
Unit tests: ubuntu \| pixi run -e test tests	3m 2s
TypeChecking: pixi run typing	0s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
merge-test-artifacts	0s
	24m 19s

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