nrunner: reorganization of unittests #2900

Job	Run time
Egg task debian:11.0	24s
Egg task debian:12.4	20s
Egg task fedora:37	49s
macOS with Python 3.11.1	11m 2s
Egg task fedora:38	53s
Egg task ubi:8.8	16s
Egg task ubuntu:20.04	23s
Egg task ubi:9.2	13s
Egg task ubuntu:22.04	21s
Build Egg for Python 3.8	12s
Experimental checks	16s
Fedora develop install/uninstall task	2m 18s
Build Egg for Python 3.9	11s
Fedora selftests	7m 33s
Build Egg for Python 3.10.0	19s
Build Egg for Python 3.11	12s
Build Package (wheel/tarball) for Python 3.8	1m 46s
Podman Egg task	12s
Build Egg for Python 3.12.0	18s
Podman spawner with 3rd party runner plugin	42s
Build Package (wheel/tarball) for Python 3.9	48s
Build Package (wheel/tarball) for Python 3.10.0	52s
Build Package (wheel/tarball) for Python 3.11	54s
Smokecheck on Linux with Python 3.8	27s
Build Package (wheel/tarball) for Python 3.12.0	1m 7s
Static checks	1m 36s
Smokecheck on Linux with Python 3.9	22s
Windows with Python 3.9	52s
Smokecheck on Linux with Python 3.10.0	36s
Windows with Python 3.10.0	2m 19s
Smokecheck on Linux with Python 3.11	1m 34s
Windows with Python 3.11	1m 6s
Version task debian:11.0	21s
Version task debian:12.4	1m 50s
Smokecheck on Linux with Python 3.12.0	35s
Windows with Python 3.12.0	1m 58s
Version task fedora:37	2m 38s
Version task fedora:38	2m 35s
Version task ubi:8.8	1m 46s
Version task ubi:9.2	18s
Version task ubuntu:20.04	34s
Version task ubuntu:22.04	2m 1s
Linux with Python 3.8	8m 5s
Linux with Python 3.9	7m 55s
Linux with Python 3.10.0	9m 3s
Linux with Python 3.11	9m 53s
Linux with Python 3.12.0	8m 30s
	1h 39m 15s

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