feature request: supports `requires-python` in "create environment.." flow

[eleanorjboyd]

feature request: I have a pyproject.toml file in my workspace which I want to select when I am going through "create environment" flow. I get to it at the end but before I get there I have to select my python version. My pyproject.toml file has requires-python = ">3.10" so it would be great if given this, the create environments flow would let