Add CI workflow for flaky runs #2559

Job	Run time
GHA Security Analysis using Zizmor	16s
should run ci	17s
cache-pixi-lock	7s
build-and-upload-nightly-parcels	2m 12s
TypeChecking: pixi run typing	2m 4s
Flaky unit tests: ubuntu \| pixi run -e test tests -m 'flaky'	3m 41s
Unit tests: ubuntu \| pixi run -e test-py313 tests	6m 35s
Unit tests: windows \| pixi run -e test tests	13m 49s
Unit tests: ubuntu \| pixi run -e test-py311 tests	7m 25s
Unit tests: ubuntu \| pixi run -e test tests	5m 41s
Unit tests: ubuntu \| pixi run -e test-minimum tests	8m 9s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
merge-test-artifacts	0s
	50m 16s

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