ci: attempt to divide up longtests (#4631) #7455

Job	Run time
Linux tests (3.8)	8m 58s
Linux tests (3.9)	9m 21s
Linux tests (3.11)	7m 8s
Documentation	51s
Linux tests (3.12)	8m 25s
Long tests on Python 3.10	35m 8s
Long tests on Python 3.10 (language parsers)	6m 29s
Long tests on Python 3.10 (scanners)	21m 3s
Long tests on Python 3.10 (synchronous)	26m 5s
Tests that may fail due to network or HTML	4m 4s
Windows long tests	1h 21m 19s
	3h 28m 51s

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