Related problem

the tests of the standard library uses the modules (relative) paths to import required commands, e.e

use std.nu 'assert equal'

now, we have a prelude loading thanks to #8627, which loads the help commands from #8505.
things can now be imported from anywhere with

use std ...

Note
we do not need the name of the file std.nu but only the "abstract" name of the library, i.e. std[

Describe the solution you'd like

i think we should use

use std ...

in the tests not to rely on the filesystem paths.

we also need to mention in the README that, as the library is now embedded in the nu binary, we should run the tests with

cargo run -- crates/nu-std/tests.nu

to avoid using the installed nu which could be quite out of sync 🤔

Describe alternatives you've considered

No response

Additional context and details

No response