Decoupled singularity test from the rest of the CI matrix; updated si… #542

Job	Run time
setup	16s
ex002	39m 32s
ex001-singularity	15m 15s
ex001-by-step	1h 13m 37s
ex001 (--viz, true)	10m 17s
ex001 (--start-at illumination --stop-at registration)	10m 3s
ex001 (--background)	10m 29s
ex001 (--background --background-method imagej-rolling-ball)	10m 34s
ex001 (--segmentation cypository --cypository-opts '--channel 10 --scalingFactor 2' --s3seg-opts ...	4m 59s
ex001 (--segmentation ilastik,mesmer)	4m 10s
ex001 (--segmentation cellpose --mcquant-opts '--masks *masks.tif')	6m 34s
	3h 5m 46s

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