Disentangle kernel-manager include tree #7197

Job	Run time
shellcheck	19s
cppcheck	4m 21s
clang-format	24s
isort	17s
pre-commit-hooks	1m 24s
copyright_headers	23s
lychee_IGNORED	1m 46s
flake8	25s
forbidden_types	20s
pylint	44s
black	35s
pydocstyle	25s
vale	40s
rstcheck	26s
mypy	38s
no-crlf	19s
unused_names	19s
sphinx-rtd	3m 18s
sphinx-conda	0s
build_linux (ubuntu-22.04, gcc, optimize, warning)	8m 43s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	22m 5s
build_linux (ubuntu-22.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	28m 7s
build_linux (ubuntu-22.04, gcc, boost, optimize, warning)	9m 58s
build_linux (ubuntu-22.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	15m 12s
build_linux (ubuntu-22.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	14m 56s
	1h 56m 4s

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