[9.0] patches for RAM calculations #13976

Job	Run time
shellcheck	9s
pycodestyle	8s
pre-commit	1m 4s
Pylint for Python 2.7 in Pilot files	52s
DiracX Unit Tests	6h 0m 24s
check (pylint -j 0 -E src/)	3m 34s
check (mypy)	2m 34s
check (pytest --runslow -k 'not test_BaseType_Unicode and not test_nestedStructure')	14m 9s
	6h 22m 54s

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