rewrite of testdata communication, and other improvements #725

Job	Run time
e2e tests local	5m 15s
documentation / script inventory	3s
linting	1m 7s
e2e tests dist	19m 11s
test-and-coverage / ubuntu-latest / python-3.9	1m 8s
test-and-coverage / ubuntu-latest / python-3.10	1m 7s
test-and-coverage / ubuntu-latest / python-3.11	1m 4s
test-and-coverage / ubuntu-latest / python-3.12	1m 56s
test-and-coverage / windows-latest / python-3.12	2m 53s
documentation / script/docs-generate-changelog.py	35s
documentation / script/docs-generate-licenses.py	36s
documentation / script/docs-generate.bash	57s
documentation / build	2m 58s
releasable	3s
	38m 53s

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