docs: Refactor and add test for `paginated_return_data.py` #4585

Job	Run time
pyright	43s
mypy	1m 0s
slotscheck	23s
validate	18s
Test server integration (uvicorn<0.27.0)	38s
Test Minimal Application with Base Dependencies	17s
Test server integration (uvicorn>=0.27.0)	38s
test-platform-compat	0s
Test Minimal Pydantic 1 application	13s
test (3.10) / test	1m 43s
test (3.11) / test	1m 34s
test (3.12) / test	2m 56s
test (3.8) / test	2m 50s
test (3.9) / test	1m 54s
build-docs	1m 15s
codeql	2m 4s
upload-test-coverage	17s
sonar	1m 6s
	19m 49s

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