Add warnings for unresolved markers #1321

Job	Run time
Run linters (pylint)	1m 37s
Run tests (3.10)	1m 51s
Run tests with different pydantic versions	3m 20s
Run linters (pydocstyle)	1m 40s
Run tests (3.11)	1m 55s
Run tests (3.12)	2m 3s
Run linters (mypy)	1m 43s
Run tests (3.13)	1m 57s
Run tests with coverage	2m 52s
Run tests (3.9)	1m 53s
Run tests (3.8)	1m 50s
Run linters (flake8)	1m 33s
	24m 14s

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