Add a way to pass only a few common variables

[henryiii]

          `tox`[^1] do a lot of magic to pass the correct values.

Should nox stay this clean way?

Maybe some more configurable?

include_outer_env: Literal["all", "recommended", "none"]

while recommended will pass a similar list of environment variables like in tox.

e.g. on my setup I need to set HOME again, otherwise it wouldn't find my .netrc with the credentials for a private pypi repository.

Originally posted by @Wurstnase in #868 (comment)