[movie-lister] Added test fixture and updated documentation (#747) #1144

Job	Run time
Run tests with different pydantic versions	3m 50s
Run linters (flake8)	1m 52s
Run tests (3.8)	2m 12s
Run linters (pydocstyle)	1m 55s
Run tests (3.9)	2m 14s
Run tests with coverage	3m 8s
Run linters (mypy)	2m 0s
Run tests (3.10)	2m 5s
Run linters (pylint)	1m 59s
Run tests on legacy versions (3.7)	2m 15s
Run tests (3.11)	2m 10s
Run tests (3.12)	2m 13s
Run tests (3.13)	2m 22s
	30m 15s

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