pixi list should print a warning or fail when lockfile is not up to date

[pavelzw]

After manually tinkering in pixi.toml, pixi list doesn't reflect these changes unless I run pixi install. Maybe a warning like Warning: your lockfile is not up to date. Please run 'pixi install' to update your lockfile could be nice.

[ruben-arts]

Should it even self install or just throw a warning?

[pavelzw]

I guess we could also do self-install on pixi list. I don't have strong opinions on that but maybe it's better since we do it like this for other cases as well 🤷🏻

[baszalmstra]

I wouldnt install as it provides no benefit right? Just overhead? We could add the same --locked and --frozen though!