Register only spikes actually sent with weight_recorder #4651

Job	Run time
black	27s
clang-format	20s
copyright_headers	18s
cppcheck	3m 35s
flake8	19s
forbidden_types	20s
isort	22s
lychee_IGNORED	26s
mypy	37s
pydocstyle	21s
pylint	38s
rstcheck	23s
unused_names	15s
vale	31s
sphinx-rtd	5m 24s
sphinx-conda	0s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	30m 25s
build_linux (ubuntu-20.04, gcc, boost, optimize, warning)	12m 21s
build_linux (ubuntu-20.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	16m 48s
build_linux (ubuntu-20.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	18m 36s
build_linux (ubuntu-20.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	24m 32s
	1h 56m 58s

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