Add CI workflow for flaky runs #2552

Job	Run time
GHA Security Analysis using Zizmor	14s
should run ci	6s
cache-pixi-lock	1m 5s
Falky unit tests: ubuntu \| pixi run -e test tests -m 'flaky'	3m 53s
TypeChecking: pixi run typing	2m 2s
build-and-upload-nightly-parcels	2m 7s
Unit tests: ubuntu \| pixi run -e test-py313 tests	9m 10s
Unit tests: ubuntu \| pixi run -e test-py311 tests	7m 5s
Unit tests: ubuntu \| pixi run -e test-minimum tests	9m 29s
Unit tests: ubuntu \| pixi run -e test tests	7m 18s
Unit tests: windows \| pixi run -e test tests	16m 49s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
merge-test-artifacts	0s
	59m 18s

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