rewrite of testdata communication, and other improvements #726

Job	Run time
documentation / script inventory	2s
test-and-coverage / ubuntu-latest / python-3.9	1m 10s
linting	1m 10s
test-and-coverage / ubuntu-latest / python-3.10	1m 13s
e2e tests local	5m 27s
test-and-coverage / ubuntu-latest / python-3.11	1m 4s
e2e tests dist	19m 26s
test-and-coverage / ubuntu-latest / python-3.12	1m 53s
test-and-coverage / windows-latest / python-3.12	3m 56s
documentation / script/docs-generate-changelog.py	29s
documentation / script/docs-generate-licenses.py	31s
documentation / script/docs-generate.bash	47s
documentation / build	2m 50s
releasable	1s
	39m 59s

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