Add option to disable env var interpolation in configs (#861) #1179

Job	Run time
Run tests with coverage	2m 58s
Run tests (3.8)	2m 5s
Run tests (3.9)	2m 1s
Run tests with different pydantic versions	3m 39s
Run tests on legacy versions (3.7)	2m 10s
Run tests (3.10)	2m 6s
Run linters (flake8)	1m 46s
Run tests (3.11)	2m 1s
Run linters (pydocstyle)	1m 45s
Run tests (3.12)	2m 10s
Run tests (3.13)	2m 4s
Run linters (mypy)	1m 49s
Run linters (pylint)	1m 55s
	28m 29s

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