Add option to disable env var interpolation in configs #1170

Job	Run time
Run tests on legacy versions (3.7)	2m 12s
Run tests (3.8)	2m 7s
Run tests (3.9)	2m 9s
Run tests (3.10)	2m 9s
Run tests (3.11)	2m 3s
Run tests (3.12)	2m 7s
Run tests with coverage	3m 10s
Run tests (3.13)	2m 5s
Run linters (flake8)	1m 49s
Run tests with different pydantic versions	3m 40s
Run linters (pydocstyle)	1m 44s
Run linters (mypy)	1m 52s
Run linters (pylint)	1m 48s
	28m 55s

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