Add CI workflow for flaky runs (#2618) #2560

Job	Run time
GHA Security Analysis using Zizmor	13s
should run ci	4s
cache-pixi-lock	57s
Flaky unit tests: ubuntu \| pixi run -e test tests -m 'flaky'	3m 1s
build-and-upload-nightly-parcels	3m 8s
TypeChecking: pixi run typing	2m 4s
Unit tests: ubuntu \| pixi run -e test tests	6m 14s
Unit tests: ubuntu \| pixi run -e test-minimum tests	6m 11s
Unit tests: ubuntu \| pixi run -e test-py313 tests	5m 53s
Unit tests: windows \| pixi run -e test tests	15m 9s
Unit tests: ubuntu \| pixi run -e test-py311 tests	7m 42s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
merge-test-artifacts	0s
	50m 36s

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